Converting a program in matlab to C#

maxtab = [];
mintab = [];

v = v(:); % Just in case this wasn't a proper vector

if nargin < 3
  x = (1:length(v))';
else
  x = x(:);
  if length(v)~= length(x)
    error('Input vectors v and x must have same length');
  end
end

if (length(delta(:)))>1
  error('Input argument DELTA must be a scalar');
end

if delta <= 0
  error('Input argument DELTA must be positive');
end

mn = Inf; mx = -Inf;
mnpos = NaN; mxpos = NaN;

lookformax = 1;

for i=1:length(v)
  this = v(i);
  if this > mx, mx = this; mxpos = x(i); end
  if this < mn, mn = this; mnpos = x(i); end

  if lookformax
    if this < mx-delta
      maxtab = [maxtab ; mxpos mx];
      mn = this; mnpos = x(i);
      lookformax = 0;
    end
  else
    if this > mn+delta
      mintab = [mintab ; mnpos mn];
      mx = this; mxpos = x(i);
      lookformax = 1;
    end
  end
end

public double[,] EncontraPicos(double[] Y, double Delta, double[] T)
        {
            for (int i = 0; i < (Y.Length -1); i++)
            {
                This = Y[i];
                if (This > mx)
                {
                    mx = This;
                    mxpos = T[i];
                }
                if (This < mn)
                {
                    mn = This;
                    mnpos = T[i];
                }

                if (lookformax)
                {
                    if (This < (mx - Delta))
                    {
                        Ymax.Add(mx);
                        Tmax.Add(mxpos);
                        mn = This;
                        mnpos = T[i];
                        lookformax = false;
                        //j++;
                    }
                    if (This > (mn + Delta))
                    {
                        Ymin.Add(mn);
                        Tmin.Add(mnpos);
                        mx = This;
                        mxpos = T[i];
                        lookformax = true;
                       // k++;
                    }
                }
            }
            return maxtab;
        }