How to convert C++ code into Matlab. How to write the below given part of code into matlab

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vandana 2015-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/234380-how-to-convert-c-code-into-matlab-how-to-write-the-below-given-part-of-code-into-matlab

评论： Guillaume 2015-8-18

double logistic(double x)
{
  if(x > 100.0) x = 1.0;
  else if (x < -100.0) x = 0.0;
  else x = 1.0/(1.0+exp(-x));
  return x;
}
void ComputeFeedForwardSignals(double* MAT_INOUT,double* V_IN,double* V_OUT, double* V_BIAS,int size1,int size2,int layer)
{
  int row,col;
  for(row=0;row < size2; row++) 
    {
      V_OUT[row]=0.0;
      for(col=0;col<size1;col++)V_OUT[row]+=(*(MAT_INOUT+(row*size1)+col)*V_IN[col]);
      V_OUT[row]+=V_BIAS[row];
      if(layer==0) V_OUT[row] = tanh(V_OUT[row]);
      if(layer==1) V_OUT[row] = logistic(V_OUT[row]);
   }
}

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Guillaume 2015-8-18

A basic knowledge of C and matlab is enough to translate the above code, so what difficulties are you encountering?

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Answer 1

Titus Edelhofer 2015-8-18

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在 MATLAB Online 中打开

Hi Vandana,

that should be straight forward:

function y = logistic(x)
y = zeros(size(x));
y(x>100) = 1.0;
idx = x>=-100 & x<=100;
y(idx) = 1.0./(1.0+exp(-x));

and the main function

function V_OUT = ComputeFeedForwardSignals(MAT, V_IN, V_BIAS, layer)
V_OUT = MAT * V_IN + V_BIAS;
switch layer
case 0
  V_OUT = tanh(V_OUT);
case 1
  V_OUT = logistic(V_OUT);
otherwise
  error('Unknown value for layer.')
end