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hey guys,

i hav being trying for a very long time to design a c++ programme that solves second order differential equations as a final year proj. I got some codes from the resource material i have been working with; i keep getting errors compiling the codes.

pls i need help debuging this errors. i use visual studio pro edition.

Below is the error:

1>Code10.obj : error LNK2019: unresolved external symbol "double __cdecl parse(class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > >,int,double * const,int * const)" (?parse@@YANV?$CStringT@DV?$StrTraitMFC_DLL@DV?$ChTraitsCRT@D@ATL@@@@@ATL@@HQANQAH@Z) referenced in function "public: void __thiscall CCode10::ODE1RK2(void)" (?ODE1RK2@CCode10@@QAEXXZ)


Below is the source code:(Header code)
<br />#include <afxwin.h><br />#include <afxcmn.h><br />#include <math.h><br />#define M 200<br />#define IDC_BUTTON 501<br />#define maxInput 11<br />#define nMenuItems 8<br />	<br />extern double parse(CString,int,double [],int []);<br /><br />class CCode10 : public CFrameWnd<br />{<br />protected:<br />	typedef struct<br />	{<br />		double x,y,p,z;			// components<br />	} PT;<br />	PT *pt;<br />	typedef struct<br />	{<br />		CString item,label;		// input string and its label<br />		CPoint hm;				// home coordinates<br />		CEdit ed;				// edit box<br />		CRect rc;				// rectangular region<br />	} INPUT;<br />	INPUT input[maxInput+1];<br />	typedef struct<br />	{<br />		CString item;			// menu item<br />		CPoint hm;				// home coordinates<br />		CRect rc;				// rectangular region<br />	} MENU;<br />	MENU menu[nMenuItems+1];<br />	typedef struct<br />	{<br />		CRect rc;				// rectangular region<br />		CPoint hm,end;			// starting and end coordinates<br />	} CURVE;<br />	CURVE curve;<br />	CListCtrl table;<br />	CFont Arial80;<br />	CButton btn;<br />	int m,idc,nInputItems,fMenu,fStatus;<br />public:<br />	CCode10();<br />	~CCode10();<br />	void ODE1RK2(),ODE1RK4(),ODE1System();<br />	void ODE1Taylor(),ODE1AB(),ODE2toODE1System();<br />	void ODE2FD1(),ODE2FD2(),SolveSLE(double **,double *);<br />	void DrawCurve(),ShowTable(),Clear(CRect);<br />	afx_msg void OnPaint(),OnLButtonDown(UINT,CPoint);<br />	afx_msg void OnButton();<br />	DECLARE_MESSAGE_MAP()<br />};<br /><br />class CMyWinApp : public CWinApp<br />{<br />public:<br />	virtual BOOL InitInstance();<br />};</code><br /><br /><br />and the c++ code:<br /><br /><code>#include "Code10.h"<br />CMyWinApp MyApplication;<br />BOOL CMyWinApp::InitInstance()<br />{<br />    CCode10* pFrame = new CCode10;<br />    m_pMainWnd = pFrame;<br />    pFrame->ShowWindow(SW_SHOW);<br />    pFrame->UpdateWindow();<br />    return TRUE;<br />}<br /><br />BEGIN_MESSAGE_MAP(CCode10,CFrameWnd)<br />	ON_WM_PAINT()<br />	ON_WM_LBUTTONDOWN()<br />    ON_BN_CLICKED(IDC_BUTTON,OnButton)<br />END_MESSAGE_MAP()<br /><br />CCode10::CCode10()<br />{	<br />	Create(NULL,"Code10: Ordinary Differential Equations",<br />		WS_OVERLAPPEDWINDOW,CRect(0,0,800,635),NULL);<br />	Arial80.CreatePointFont(80,"Arial");<br />	pt=new PT [M+1];<br />	fMenu=0; fStatus=0; idc=301;<br />	curve.hm=CPoint(330,320); curve.end=CPoint(750,570);<br />	curve.rc=CRect(curve.hm.x-10,curve.hm.y-10,<br />		curve.end.x+30,curve.end.y+10);<br />	menu[1].item="ODE 1: Taylor (Order 3)"; <br />	menu[2].item="ODE 1: Runge-Kutta 2";<br />	menu[3].item="ODE 1: Runge-Kutta 4"; <br />	menu[4].item="ODE 1: Adams-Bashforth";<br />	menu[5].item="ODE 1: System"; <br />	menu[6].item="ODE 2: Initial Value Problem";<br />	menu[7].item="ODE 2: Finite-Difference 1"; <br />	menu[8].item="ODE 2: Finite-Difference 2";<br />	for (int i=1;i<=nMenuItems;i++)<br />	{<br />		menu[i].hm=CPoint(20,30+(i-1)*30);<br />		menu[i].rc=CRect(menu[i].hm.x,menu[i].hm.y,<br />			menu[i].hm.x+150,menu[i].hm.y+20);<br />	}<br />	input[0].hm=CPoint(200,10);<br />	input[0].rc=CRect(input[0].hm.x,input[0].hm.y,<br />		input[0].hm.x+560,input[0].hm.y+280);<br />	for (int i=1;i<=maxInput;i++)<br />		input[i].hm=CPoint(input[0].hm.x+10,input[0].hm.y+30+(i-1)*25);<br />}<br /><br />CCode10::~CCode10()<br />{	<br />	delete pt;<br />}<br /><br />void CCode10::OnPaint()<br />{<br />	<br />	CPaintDC dc(this);<br />	CString str;<br />	dc.SelectObject(Arial80);<br />	dc.SetBkColor(RGB(150,150,150));<br />	dc.SetTextColor(RGB(255,255,255));<br />	for (int i=1;i<=nMenuItems;i++)<br />	{<br />		dc.FillSolidRect(&menu[i].rc,RGB(150,150,150));<br />		dc.TextOut(menu[i].hm.x+5,menu[i].hm.y+5,menu[i].item);<br />	}<br />	dc.SetBkColor(RGB(255,255,255));<br />	dc.SetTextColor(RGB(100,100,100));<br />	dc.Rectangle(input[0].rc);<br />	dc.TextOut(input[0].hm.x+150,input[0].hm.y+5,menu[fMenu].item);<br />	if (fMenu>0)<br />	{<br />		for (int i=1;i<=nInputItems;i++)<br />			dc.TextOut(input[i].hm.x+10,input[i].hm.y,input[i].label);<br />		if (fStatus==2)<br />		{<br />			DrawCurve();<br />			fStatus=1;<br />		}<br />	}<br />	if (fMenu==2)<br />		dc.TextOut(input[6].hm.x+10,input[6].hm.y,input[6].label);<br />	if (fMenu==7)<br />		dc.TextOut(input[0].hm.x+300,input[0].hm.y+5,<br />		"p(x) y\"+q(x) y'+r(x) y = w(x),  x[0]<=x<=x[m]");<br />	if (fMenu==8)<br />		dc.TextOut(input[0].hm.x+300,input[0].hm.y+5,<br />		"p(x) y\"+q(x) y'+r(x) y = w(x),  x[0]<=x<=x[m]");<br />}<br /><br />void CCode10::DrawCurve()<br />{<br />	CClientDC dc(this);<br />	<br />	double m1,m2,c1,c2;<br />	CString str;<br />	CPoint px,px2;<br />	PT top,bottom,max,min,left,right;<br />	Clear(curve.rc);<br />	left.x=pt[0].x; right.x=pt[m].x;<br />	left.y=pt[0].y;<br />	max.y=pt[0].y; min.y=pt[0].y;<br />	<br />	if (fMenu==5)<br />	{<br />		max.z=pt[0].z; <br />		min.z=pt[0].z;<br />	}<br />	for (int i=0;i<=m;i++)<br />	{<br />		if (max.y<pt[i].y)<br />			max.y=pt[i].y;	<br />		if (min.y>pt[i].y)<br />			min.y=pt[i].y;<br />		if (fMenu==5)<br />		{<br />			if (max.z<pt[i].z)<br />				max.z=pt[i].z;<br />			if (min.z>pt[i].z)<br />				min.z=pt[i].z;<br />		}<br />	}<br />	top.y=max.y; bottom.y=min.y;<br />	if (fMenu==5)<br />	{<br />		if (max.y<max.z)<br />			top.y=max.z;<br />		if (min.y>min.z)<br />			bottom.y=min.z;<br />	}<br /><br />	// Cartesian-Windows conversion coordinates<br />	m1=(double)(curve.end.x-curve.hm.x)/(right.x-left.x);<br />	c1=(double)curve.hm.x-left.x*m1;<br />	m2=(double)(curve.hm.y-curve.end.y)/(top.y-bottom.y);<br />	c2=(double)curve.end.y-bottom.y*m2;<br /><br />	// Draw & label the x,y axes<br />	CPen pGray(PS_SOLID,1,RGB(100,100,100));<br />	dc.SelectObject(pGray);<br />	dc.SelectObject(Arial80);<br />	px=CPoint(m1*0+c1,m2*bottom.y+c2); dc.MoveTo(px);<br />	px=CPoint(m1*0+c1,m2*top.y+c2); dc.LineTo(px);<br />	<br />	px=CPoint(m1*left.x+c1,m2*0+c2); dc.MoveTo(px);<br />	str.Format("%.0lf",left.x); dc.TextOut(px.x,px.y,str);<br />	px=CPoint(m1*right.x+c1,m2*0+c2); dc.LineTo(px);<br />	str.Format("%.0lf",right.x); dc.TextOut(px.x-10,px.y,str);<br /><br />	// draw the curve<br />	CPen pDark(PS_SOLID,2,RGB(50,50,50));<br />	dc.SelectObject(pDark);<br />	//str.Format("(%.1lf,%.1lf)",left.x,left.y);<br />	//dc.TextOut((int)(m1*left.x+c1),(int)(m2*left.y+c2),str);<br />	for (int i=0;i<=m;i++)<br />	{<br />		px=CPoint((int)(m1*pt[i].x+c1),(int)(m2*pt[i].y+c2));<br />		if (i==0)<br />			dc.MoveTo(px);<br />		else<br />			dc.LineTo(px);<br />		if (pt[i].y==top.y)<br />		{<br />			str.Format("%.3lf",top.y); <br />			dc.TextOut(px.x,px.y-10,str);<br />		}<br />		if (pt[i].y==bottom.y)<br />		{<br />			str.Format("%.3lf",bottom.y); <br />			dc.TextOut(px.x,px.y,str);<br />		}<br />	}<br />	if (fMenu==5)<br />	{<br />		CPen pLight(PS_SOLID,2,RGB(150,150,150));<br />		dc.SelectObject(pLight);<br />		for (int i=0;i<=m;i++)<br />		{<br />			px2=CPoint((int)(m1*pt[i].x+c1),(int)(m2*pt[i].z+c2));<br />			if (i==0)<br />			{<br />				dc.MoveTo(px2);<br />				dc.TextOut(px2.x+15,px2.y-10,"z=g(x)");<br />			}<br />			else<br />				dc.LineTo(px2);<br />		}<br />	}<br />}<br /><br />void CCode10::OnLButtonDown(UINT nFlags,CPoint pt)<br />{<br />	int i,k;<br />	for (k=1;k<=nMenuItems;k++)<br />		if (menu[k].rc.PtInRect(pt))<br />		{<br />			fMenu=k; fStatus=1;<br />			switch(k)<br />			{<br />				case 1: <br />					nInputItems=7; <br />					input[1].label="y'=g(x,y)";<br />					input[2].label="x[0]"; <br />					input[3].label="x[m]";<br />					input[4].label="h"; <br />					input[5].label="y[0]"; <br />					input[6].label="y'' (u=y')";<br />					input[7].label="y'''(v=y'')";<br />					break;<br />				case 2: <br />					nInputItems=6; <br />					input[1].label="y'=g(x,y)"; <br />					input[2].label="x[0]"; <br />					input[3].label="x[m]";<br />					input[4].label="h"; <br />					input[5].label="y[0]"; <br />					input[6].label="r (0<r<=1)";<br />					break;<br />				case 3: <br />					nInputItems=5; <br />					input[1].label="y'=g(x,y)"; <br />					input[2].label="x[0]"; <br />					input[3].label="x[m]";<br />					input[4].label="h"; <br />					input[5].label="y[0]"; <br />					break;<br />				case 4: <br />					nInputItems=5; <br />					input[1].label="y'=g(x,y)"; <br />					input[2].label="x[0]"; <br />					input[3].label="x[m]";<br />					input[4].label="h"; <br />					input[5].label="y[0]"; <br />					break;<br />				case 5: <br />					nInputItems=7; <br />					input[1].label="y'=f(x,y,z)"; <br />					input[2].label="z'=g(x,y,z)"; <br />					input[3].label="x[0]"; <br />					input[4].label="y[0]";	<br />					input[5].label="z[0]";<br />					input[6].label="h"; <br />					input[7].label="x[m]";<br />					break;<br />				case 6: <br />					nInputItems=6; <br />					input[1].label="y\"=f(x,y,z=y')"; <br />					input[2].label="x[0]"; <br />					input[3].label="y[0]"; <br />					input[4].label="z[0]=y'[0]";<br />					input[5].label="h"; <br />					input[6].label="x[m]";<br />					break;<br />				case 7: <br />					nInputItems=9; <br />					input[1].label="p(x)"; <br />					input[2].label="q(x)"; <br />					input[3].label="r(x)"; <br />					input[4].label="w(x)";<br />					input[5].label="h"; <br />					input[6].label="x[0]"; <br />					input[7].label="x[m]";<br />					input[8].label="y[0]"; <br />					input[9].label="y[m]";<br />					break;<br />				case 8: <br />					nInputItems=9; <br />					input[1].label="p(x)"; <br />					input[2].label="q(x)"; <br />					input[3].label="r(x)"; <br />					input[4].label="w(x)";<br />					input[5].label="h"; <br />					input[6].label="x[0]";<br />					input[7].label="x[m]"; <br />					input[8].label="y'[0]";<br />					input[9].label="y'[m]";<br />					break;<br />			}<br />			for (i=1;i<=maxInput;i++)<br />				input[i].ed.DestroyWindow();<br />			for (i=1;i<=nInputItems;i++)<br />				input[i].ed.Create(WS_CHILD| WS_VISIBLE| WS_BORDER, <br />					CRect(input[i].hm.x+100,input[i].hm.y,<br />					input[i].hm.x+520,input[i].hm.y+20),this,idc++);<br />			InvalidateRect(input[0].rc);<br />			Clear(curve.rc);<br />			table.DestroyWindow();<br />			btn.DestroyWindow();<br />			btn.Create("Compute",WS_CHILD| WS_VISIBLE| BS_DEFPUSHBUTTON,<br />				CRect(CPoint(input[0].hm.x+10,input[0].hm.y+5),<br />				CSize(100,20)),this,IDC_BUTTON);<br />		}<br />}<br /><br />void CCode10::ODE1RK2()<br />{<br />	int i,psi[6];<br />	double h,r,psv[6],tmp,max;<br />	double k1,k2;<br />	pt[0].x=atof(input[2].item); <br />	pt[0].y=atof(input[5].item);<br />	h=atof(input[4].item); <br />	tmp=atof(input[3].item); <br />	m=(tmp-pt[0].x)/h; m=((m<M)?m:M);<br />	max=pt[0].x+(double)m*h;<br />	tmp=(tmp<max)?tmp:max;<br />	pt[m].x=tmp;<br />	r=atof(input[6].item);<br />	psi[1]=23; psi[2]=24;<br />	for (i=0;i<=m;i++)<br />	{<br />		psv[1]=pt[i].x;<br />		psv[2]=pt[i].y;<br />		k1=h*parse(input[1].item,2,psv,psi);<br />		psv[1]=pt[i].x+r*h;<br />		psv[2]=pt[i].y+r*k1;<br />		k2=h*parse(input[1].item,2,psv,psi);<br />		if (i<m)<br />		{<br />			pt[i+1].y=pt[i].y+(1-1/(2*r))*k1+1/(2*r)*k2;<br />			pt[i+1].x=pt[i].x+h;<br />		}<br />	}<br />}<br /><br />void CCode10::ODE1RK4()<br />{<br />	<br />	int i,psi[6];<br />	double h,psv[6],tmp,max;<br />	double k1,k2,k3,k4;<br />	pt[0].x=atof(input[2].item); <br />	pt[0].y=atof(input[5].item);<br />	h=atof(input[4].item); <br />	tmp=atof(input[3].item); <br />	m=(tmp-pt[0].x)/h; m=((m<M)?m:M);<br />	max=pt[0].x+(double)m*h;<br />	tmp=(tmp<max)?tmp:max;<br />	pt[m].x=tmp;<br />	psi[1]=23; psi[2]=24;<br />	for (i=0;i<=m;i++)<br />	{<br />		psv[1]=pt[i].x;<br />		psv[2]=pt[i].y;<br />		k1=h*parse(input[1].item,2,psv,psi);<br /><br />		psv[1]=pt[i].x+h/2;<br />		psv[2]=pt[i].y+k1/2;<br />		k2=h*parse(input[1].item,2,psv,psi);<br /><br />		psv[1]=pt[i].x+h/2;<br />		psv[2]=pt[i].y+k2/2;<br />		k3=h*parse(input[1].item,2,psv,psi);<br /><br />		psv[1]=pt[i].x+h;<br />		psv[2]=pt[i].y+k3;<br />		k4=h*parse(input[1].item,2,psv,psi);<br />		if (i<m)<br />		{<br />			pt[i+1].y=pt[i].y+(k1+2*k2+2*k3+k4)/6;<br />			pt[i+1].x=pt[i].x+h;<br />		}<br />	}<br />}<br /><br />void CCode10::ShowTable()<br />{<br />	CString str;<br />	CPoint hTable=CPoint(20,310);<br />	CRect rcTable=CRect(hTable.x,hTable.y,hTable.x+280,hTable.y+290);<br />	table.DestroyWindow();<br />    table.Create(WS_VISIBLE | WS_CHILD | WS_DLGFRAME | LVS_REPORT<br />        | LVS_NOSORTHEADER,rcTable,this,idc++);<br />	table.InsertColumn(0,"i",LVCFMT_CENTER,25);<br />	table.InsertColumn(1,"x",LVCFMT_CENTER,70);<br />	table.InsertColumn(2,"y=f(x)",LVCFMT_CENTER,70);<br />	if (fMenu==4 || fMenu==5)<br />		table.InsertColumn(3,((fMenu==4)?"p":"z"),LVCFMT_CENTER,70);<br />	for (int i=0;i<=m;i++)<br />	{<br />		str.Format("%d",i); table.InsertItem(i,str,0);<br />		str.Format("%lf",pt[i].x); table.SetItemText(i,1,str);<br />		str.Format("%lf",pt[i].y); table.SetItemText(i,2,str);<br />		if (fMenu==4 && i>3)<br />		{<br />			str.Format("%lf",pt[i].p); <br />			table.SetItemText(i,3,str);<br />		}<br />		if (fMenu==5)<br />		{<br />			str.Format("%lf",pt[i].z); <br />			table.SetItemText(i,3,str);<br />		}<br />	}<br />}<br /><br />void CCode10::OnButton()<br />{<br />	if (fStatus==1)<br />	{<br />		for (int i=1;i<=nInputItems;i++)<br />			input[i].ed.GetWindowText(input[i].item);<br />		switch(fMenu)<br />		{<br />			case 1:<br />				ODE1Taylor(); fStatus=2; break;<br />			case 2:<br />				ODE1RK2(); fStatus=2; break;<br />			case 3:<br />				ODE1RK4(); fStatus=2; break;<br />			case 4:<br />				ODE1AB(); fStatus=2; break;<br />			case 5:<br />				ODE1System(); fStatus=2; break;<br />			case 6:				<br />				ODE2toODE1System(); fStatus=2; break;<br />			case 7:				<br />				ODE2FD1(); fStatus=2; break;<br />			case 8:				<br />				ODE2FD2(); fStatus=2; break;<br />		}<br />	}<br />	if (fStatus=2)<br />	{<br />		ShowTable();			<br />		InvalidateRect(curve.rc);<br />	}<br />}<br /><br />void CCode10::ODE1System()<br />{<br />	<br />	int i,psi[6];<br />	double h,psv[6],tmp,max;<br />	double k1,k2,k3,k4;<br />	double K1,K2,K3,K4;<br />	pt[0].x=atof(input[3].item); <br />	pt[0].y=atof(input[4].item); <br />	pt[0].z=atof(input[5].item);<br />	h=atof(input[6].item); <br />	tmp=atof(input[7].item);<br />	m=(tmp-pt[0].x)/h; m=((m<M)?m:M);<br />	max=pt[0].x+(double)m*h;<br />	tmp=(tmp<max)?tmp:max;<br />	pt[m].x=tmp;<br />	psi[1]=23; psi[2]=24; psi[3]=25;<br />	for (i=0;i<=m;i++)<br />	{<br />		psv[1]=pt[i].x;<br />		psv[2]=pt[i].y;<br />		psv[3]=pt[i].z;<br />		k1=h*parse(input[1].item,3,psv,psi); <br />		K1=h*parse(input[2].item,3,psv,psi);<br /><br />		psv[1]=pt[i].x+h/2;<br />		psv[2]=pt[i].y+k1/2;<br />		psv[3]=pt[i].z+K1/2;<br />		k2=h*parse(input[1].item,3,psv,psi); <br />		K2=h*parse(input[2].item,3,psv,psi);<br /><br />		psv[1]=pt[i].x+h/2;<br />		psv[2]=pt[i].y+k2/2;<br />		psv[3]=pt[i].z+K2/2;<br />		k3=h*parse(input[1].item,3,psv,psi); <br />		K3=h*parse(input[2].item,3,psv,psi);<br /><br />		psv[1]=pt[i].x+h;<br />		psv[2]=pt[i].y+k3;<br />		psv[3]=pt[i].z+K3;<br />		k4=h*parse(input[1].item,3,psv,psi); <br />		K4=h*parse(input[2].item,3,psv,psi);<br /><br />		if (i<m)<br />		{<br />			pt[i+1].y=pt[i].y+(k1+2*k2+2*k3+k4)/6;<br />			pt[i+1].z=pt[i].z+(K1+2*K2+2*K3+K4)/6;<br />			pt[i+1].x=pt[i].x+h;<br />		}<br />	}<br />}<br /><br />void CCode10::ODE1Taylor()<br />{<br />	double psv[6],tmp,max;<br />	int psi[6];<br />	int i;<br />	double h,u,v,w,z;<br /><br />	pt[0].x=atof(input[2].item); <br />	pt[0].y=atof(input[5].item);<br />	h=atof(input[4].item); <br />	tmp=atof(input[3].item); <br />	m=(tmp-pt[0].x)/h; m=((m<M)?m:M);<br />	max=pt[0].x+(double)m*h;<br />	tmp=(tmp<max)?tmp:max;<br />	pt[m].x=tmp;<br />	psi[1]=23; psi[2]=24;<br />	psi[3]=20; psi[4]=21; //psi[5]=22;<br />	for (i=0;i<=m;i++)<br />	{<br />		psv[1]=pt[i].x; <br />		psv[2]=pt[i].y; <br />		u=parse(input[1].item,2,psv,psi); <br />		psv[3]=u; <br />		v=parse(input[6].item,3,psv,psi); <br />		psv[4]=v; <br />		w=parse(input[7].item,4,psv,psi);<br />		if (i<m)<br />		{<br />			pt[i+1].y=pt[i].y+h*u+pow(h,2)/2*v+pow(h,3)/6*w;<br />			pt[i+1].x=pt[i].x+h;<br />		}<br />	}<br />}<br /><br />void CCode10::ODE1AB()<br />{<br />	<br />	int i,psi[6];<br />	double h,f0,f1,f2,f3,fp,psv[6],tmp,max;<br />	double k1,k2,k3,k4;<br />	pt[0].x=atof(input[2].item); pt[0].y=atof(input[5].item);<br />	h=atof(input[4].item); <br />	tmp=atof(input[3].item); <br />	m=(tmp-pt[0].x)/h; m=((m<M)?m:M);<br />	max=pt[0].x+(double)m*h;<br />	tmp=(tmp<max)?tmp:max;<br />	pt[m].x=tmp;<br />	psi[1]=23; psi[2]=24;<br />	for (i=0;i<=m;i++)<br />	{<br />		if (i<3)<br />		{<br />			psv[1]=pt[i].x;<br />			psv[2]=pt[i].y;<br />			k1=h*parse(input[1].item,2,psv,psi);<br /><br />			psv[1]=pt[i].x+h/2;<br />			psv[2]=pt[i].y+k1/2;<br />			k2=h*parse(input[1].item,2,psv,psi);<br /><br />			psv[1]=pt[i].x+h/2;<br />			psv[2]=pt[i].y+k2/2;<br />			k3=h*parse(input[1].item,2,psv,psi);<br /><br />			psv[1]=pt[i].x+h;<br />			psv[2]=pt[i].y+k3;<br />			k4=h*parse(input[1].item,2,psv,psi);<br /><br />			pt[i+1].y=pt[i].y+(k1+2*k2+2*k3+k4)/6;<br />		}<br />		if (i<m)<br />		{<br />			pt[i+1].x=pt[i].x+h;<br />			if (i>=3)<br />			{<br />				psv[1]=pt[i-3].x;<br />				psv[2]=pt[i-3].y;<br />				f0=parse(input[1].item,2,psv,psi);<br /><br />				psv[1]=pt[i-2].x;<br />				psv[2]=pt[i-2].y;<br />				f1=parse(input[1].item,2,psv,psi);<br /><br />				psv[1]=pt[i-1].x;<br />				psv[2]=pt[i-1].y;<br />				f2=parse(input[1].item,2,psv,psi);<br /><br />				psv[1]=pt[i].x; <br />				psv[2]=pt[i].y; <br />				f3=parse(input[1].item,2,psv,psi);<br />				pt[i+1].p=pt[i].y+h/24*(-9*f0+37*f1-59*f2+55*f3);<br /><br />				psv[1]=pt[i+1].x;<br />				psv[2]=pt[i+1].p;<br />				fp=parse(input[1].item,2,psv,psi);<br />				pt[i+1].y=pt[i].y+h/24*(f1-5*f2+19*f3+9*fp);<br />			}<br />		}<br />	}<br />}<br /><br />void CCode10::ODE2toODE1System()<br />{<br />	<br />	int i,psi[6];<br />	double psv[6];<br />	double h,tmp;<br />	double k1,k2,k3,k4;<br />	double K1,K2,K3,K4;<br />	pt[0].x=atof(input[2].item); <br />	pt[0].y=atof(input[3].item); <br />	pt[0].z=atof(input[4].item);<br />	h=atof(input[5].item); <br />	tmp=atof(input[6].item); <br />	m=(tmp-pt[0].x)/h; m=((m<M)?m:M);<br />	pt[m].x=tmp;<br />	psi[1]=23; psi[2]=24; psi[3]=25;<br />	for (i=0;i<=m;i++)<br />	{<br />		psv[1]=pt[i].x;<br />		psv[2]=pt[i].y;<br />		psv[3]=pt[i].z;<br />		k1=h*pt[i].z; K1=h*parse(input[1].item,3,psv,psi);<br /><br />		psv[1]=pt[i].x+h/2;<br />		psv[2]=pt[i].y+k1/2;<br />		psv[3]=pt[i].z+K1/2;<br />		k2=h*(pt[i].z+K1/2); K2=h*parse(input[1].item,3,psv,psi);<br /><br />		psv[1]=pt[i].x+h/2; <br />		psv[2]=pt[i].y+k2/2;<br />		psv[3]=pt[i].z+K2/2;<br />		k3=h*(pt[i].z+K2/2); K3=h*parse(input[1].item,3,psv,psi);<br /><br />		psv[1]=pt[i].x+h; <br />		psv[2]=pt[i].y+k3;<br />		psv[3]=pt[i].z+K3;<br />		k4=h*(pt[i].z+K3); K4=h*parse(input[1].item,3,psv,psi);<br /><br />		if (i<m)<br />		{<br />			pt[i+1].y=pt[i].y+(k1+2*k2+2*k3+k4)/6;<br />			pt[i+1].z=pt[i].z+(K1+2*K2+2*K3+K4)/6;<br />			pt[i+1].x=pt[i].x+h;<br />		}<br />	}<br />}<br /><br />void CCode10::ODE2FD1()<br />{<br />	<br />	int i,j,psi[6];<br />	double psv[6],h,tmp;<br />	double **a,*b;<br />	double *p,*q,*r,*w;<br />	b=new double [M+1];<br />	p=new double [M+1];<br />	q=new double [M+1];<br />	r=new double [M+1];<br />	w=new double [M+1];<br />	a=new double *[M+1];<br />	h=atof(input[5].item);<br />	m=(int)(atof(input[7].item)-atof(input[6].item))/h; m=((m<M)?m:M);<br />	pt[0].x=atof(input[6].item); <br />	pt[m].x=pt[0].x+(double)m*h;<br />	pt[0].y=atof(input[8].item); <br />	pt[m].y=atof(input[9].item);<br />	psi[1]=23;<br />	for (i=1;i<=m-1;i++)<br />	{<br />		pt[i].x=pt[i-1].x+h;<br />		psv[1]=pt[i].x; <br />		p[i]=parse(input[1].item,1,psv,psi);<br />		q[i]=parse(input[2].item,1,psv,psi);<br />		r[i]=parse(input[3].item,1,psv,psi);<br />		w[i]=parse(input[4].item,1,psv,psi);<br />	}<br />	for (i=0;i<=M;i++)<br />		a[i]=new double [M+1];<br />	for (i=1;i<=m-1;i++)<br />	{<br />		for (j=1;j<=m-1;j++)<br />			a[i][j]=0;<br />		b[i]=0;<br />	}<br />	b[1]=w[1]-(p[1]/(h*h)-q[1]/(2*h))*pt[0].y;<br />	b[m-1]=w[m-1]-(p[m-1]/(h*h)+q[m-1]/(2*h))*pt[m].y;<br />	for (i=1;i<=m-1;i++)<br />	{<br />		a[i][i]=-2*p[i]/(h*h)+r[i];<br />		if (i<m-1)<br />			a[i+1][i]=p[i+1]/(h*h)-q[i+1]/(2*h);<br />		if (i>1)<br />			a[i-1][i]=p[i-1]/(h*h)+q[i-1]/(2*h);<br />		if (i>1 && i<m-1)<br />			b[i]=w[i];<br />	}<br />	SolveSLE(a,b);<br />	for (i=0;i<=M;i++)<br />		delete a[i];<br />	delete p,q,r,w,a,b;<br />}<br /><br />void CCode10::SolveSLE(double **a,double *b)<br />{<br />	int i,j,k,lo,hi;<br />	double m1,Sum;<br />	if (fMenu==7)<br />	{<br />		lo=1; hi=m-1;<br />	}<br />	if (fMenu==8)<br />	{<br />		lo=0; hi=m;<br />	}<br />	for (k=lo;k<=hi-1;k++)<br />		for (i=k+1;i<=hi;i++)<br />		{<br />			m1=a[i][k]/a[k][k];<br />			for (j=lo;j<=hi;j++)<br />				a[i][j] -= m1*a[k][j];<br />			b[i] -= m1*b[k];<br />		}<br />	for (i=hi;i>=lo;i--)<br />	{<br />    	Sum=0;<br />		pt[i].y=0;<br />		for (j=i;j<=hi;j++)<br />       		Sum += a[i][j]*pt[j].y;<br />		pt[i].y=(b[i]-Sum)/a[i][i];<br />	}<br />}<br /><br />void CCode10::ODE2FD2()<br />{<br />	<br />	int i,j,psi[6];<br />	double psv[6],tmp;<br />	double h,alpha,beta;<br />	double **a,*b;<br />	double *p,*q,*r,*w;<br />	b=new double [M+1];<br />	p=new double [M+1];<br />	q=new double [M+1];<br />	r=new double [M+1];<br />	w=new double [M+1];<br />	a=new double *[M+1];<br />	for (i=0;i<=M;i++)<br />		a[i]=new double [M+1];<br />	h=atof(input[5].item);<br />	m=(int)(atof(input[7].item)-atof(input[6].item))/h; m=((m<M)?m:M);<br />	pt[0].x=atof(input[6].item); <br />	pt[m].x=pt[0].x+(double)m*h;<br />	alpha=atof(input[8].item); beta=atof(input[9].item); <br />	for (i=0;i<=m;i++)<br />	{<br />		if (i<m)<br />			pt[i+1].x=pt[i].x+h;<br />		psv[1]=pt[i].x; psi[1]=23;<br />		p[i]=parse(input[1].item,1,psv,psi);<br />		q[i]=parse(input[2].item,1,psv,psi);<br />		r[i]=parse(input[3].item,1,psv,psi);<br />		w[i]=parse(input[4].item,1,psv,psi);<br />	}<br />	for (i=0;i<=m;i++)<br />	{<br />		for (j=0;j<=m;j++)<br />			a[i][j]=0;<br />		b[i]=0;<br />	}<br />	for (i=0;i<=m;i++)<br />	{<br />		a[i][i]=-2*p[i]/(h*h)+r[i];<br />		if (i>0 && i<m)<br />			a[i][i+1]=p[i]/(h*h)+q[i]/(2*h);<br />		if (i<m-1)<br />			a[i+1][i]=p[i+1]/(h*h)-q[i+1]/(2*h);<br />		if (i>0 && i<m)<br />			b[i]=w[i];<br />	}<br />	a[0][1]=2*p[0]/m;<br />	a[m][m-1]=2*p[m]/(h*h);<br />	b[0]=w[0]+(p[0]/(h*h)-q[0]/(2*h))*2*h*alpha;<br />	b[m]=w[m]-(p[m]/(h*h)+q[m]/(2*h))*2*h*beta;<br />	SolveSLE(a,b);<br />	for (i=0;i<=M;i++)<br />		delete a[i];<br />	delete p,q,r,w,a,b;<br />}<br /><br />void CCode10::Clear(CRect rc)<br />{<br />	CClientDC dc(this);<br />	CBrush whiteBrush(RGB(255,255,255));<br />	dc.FillRect(&rc,&whiteBrush);<br />}
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Solution 1

At the top of your code you declare:

<pre><br />extern double parse(CString,int,double [],int []);<br /></pre>

Where is this function implemented at? The linker does not know where it is. Check this resource material you mention and see if perhaps you missed copying a function.

Best Wishes,
-David Delaune
   
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