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How do you collapse millions of points into 150 x 550 = 82500 ones?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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CPallini wrote: How do you collapse millions of points into 150 x 550 = 82500 ones?
Maybe he's pushing them reeeeeeeeeeally hard.
Iain.
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There are some overlaps ... 
Maxwell Chen
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Kennis wrote: but I have over a million points to plot.
"over a million" doesn't fit in a LONG?
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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May be I explain more about what I need to do.
My boss ask me to display the waveform of IR remote control output (like what a CRO is doing  ). (The IR code of remote control consists of many carrier pulse). The information of those IR bits is stored in a bin file. Now I am able to get all data from that bin file. But I find difficulties on plotting the data. One bit consists of 2000 carrier pulse and each pulse involves 4 points (one pulse has a high level and a low level). That means one bit consists of 8000 points!!! And the bin file has 127 bits of data... How can I make it..... 
I am a C++ beginner, it is so harsh to me... 
Anyway, do you think it is possible to plot this graph??
Kennis
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Hmm well the size of an int/LONG is certainly not the problem.
And drawing lines/pixels to the screen is pretty easy.
The problem seems to be coming up with a graphical representation
of the data with a limited number of pixels. I have widescreen
monitors and only have 1680x1050 pixels to work with. You're working
with a much smaller amount, right?
Mark Salsbery
Microsoft MVP - Visual C++
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Is the data similar to this[^]?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Yes! This is the data format.
So do you mean the one point occupies one pixel of the screen? If yes, that means it is impossible to show all points in the graph, right?
If it is impossible, I will try to omit the IR carrier details. I will only use 4 points to represent one bit, and not to show the large amount of carrier pulse in a bit.
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// nonrec.cpp -- non-recursive filter design
// NRLowPass() build NR low-pass filter
// NRHighPass() build NR high-pass filter
// NRBandPass() build NR band-pass filter
#include "tools.h"
#include "ltisys.h"
// sinc() or sin(x)/x function
double sinc(double x)
{
if (x==0)
return cos(x);
else
return sin(x)/x;
}
// Create non-recursive low-pass filter by Fourier Transform method
LTISystem NRLowPass(
double freq, // corner freq (fraction of sampling rate)
int ncoeff // # coefficients
) // returns LTI system to specification
{
int i;
// convert frequency
double omega = 2 * PI * freq;
// build half-sized window from sinc function
int nhalf = ncoeff/2;
Waveform hwv(nhalf,1.0);
for (i=1;i<=nhalf;i++)
hwv[i] = omega * sinc(i*omega)/PI;
// window with (half-)hamming window
for (i=1;i<=nhalf;i++)
hwv[i] *= 0.54 + 0.46 * cos(i*PI/nhalf);
// create new LTI System
LTISystem lpfilt(2*nhalf,0);
// copy impulse response into system
// (indexed -nhalf .. 0 .. nhalf)
lpfilt.a[nhalf] = omega/PI;
for (i=1;i<=nhalf;i++) {
lpfilt.a[nhalf-i] = hwv[i];
lpfilt.a[nhalf+i] = hwv[i];
}
return lpfilt;
}
// create high-pass non-recursive filter from low-pass prototype
LTISystem NRHighPass(
double freq, // corner freq (fraction of sampling rate)
int ncoeff // # coefficients
) // returns LTI system
{
// get low-pass version
LTISystem hpfilt = NRLowPass(0.5-freq,ncoeff);
// now modulate with cos(n*PI) = +1,-1,+1,-1,...
int nhalf = hpfilt.a.count()/2;
for (int i=1;i<=nhalf;i+=2) {
hpfilt.a[nhalf-i] = -hpfilt.a[nhalf-i];
hpfilt.a[nhalf+i] = -hpfilt.a[nhalf+i];
}
return hpfilt;
}
// create band-pass non-recursive filter from low-pass prototype
LTISystem NRBandPass(
double lofreq, // low corner freq (fraction of sampling rate)
double hifreq, // high corner freq (fraction of sampling rate) }
int ncoeff // # coefficients
) // returns LTI system
{
// get low-pass prototype
LTISystem bpfilt = NRLowPass((hifreq-lofreq)/2,ncoeff);
// now modulate with cos(n*centrefreq)
int nhalf = bpfilt.a.count()/2;
double cf = 2*PI*(lofreq+hifreq)/2;
bpfilt.a[nhalf] = 2 * bpfilt.a[nhalf];
for (int i=1;i<=nhalf;i++) {
bpfilt.a[nhalf-i] = 2 * bpfilt.a[nhalf-i] * cos(i*cf);
bpfilt.a[nhalf+i] = 2 * bpfilt.a[nhalf+i] * cos(i*cf);
}
return bpfilt;
}
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Perhaps it would help if you told us what's going wrong!
Steve
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The results matched against the requirements. 
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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CPallini wrote: The results matched against the requirements.
You really tested it?!
Maxwell Chen
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Nope. I just suggested the OP the results matched against the requirements will tell what the error is.
Since we don't know both the results and the requirements, we have no chance to.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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Well, as there weren't any requirements mentioned... It exceeded all expectations!
Iain.
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Did you forget the CPMRU (Code Project Mind Reader Unit)?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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Actually the coding is to design a low pass filter to remove ecg signal noise..the coding was given my lecture for the project..when I tried to run it i got this error. ‘fatal error C1083: Cannot open include file: 'tools.h': No such file or directory’
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You should add the tools.h file folder to the Include Directories list of Visual Studio.
(Tools->Options menu item, then Project and Solutions->VC++ Directories node, then Include files item of Show Directories for listbox).
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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sir i followed as you said but im still getting the same error.
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Do you included it using double quotes, i.e. with #include "tools.h"?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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yes sir..still getting the same error
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ashwiny wrote: #include "tools.h"
If you right-click this statement, can you open the tools.h file?
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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i have tried but cannot sir
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Then that's your clue that the IDE has no idea how to find that file. What version of VS are you using?
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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