How can I calculate PCA?
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Thread: How can I calculate PCA?

  1. #1
    Join Date
    Feb 2013
    Posts
    21

    How can I calculate PCA?

    I am trying to use PCA, but it gives memory access violation error. Here is my sample code.

    Code:
    int main(...)
    {
    .................
    vector<float>input_array;
    
        for(i=0;i<number_of_lines;i++)
        {
            for(j=0;j<feature_vector_size;j++)
            {
                input_array.push_back(read_feature[i][j]);  
            }
    
            Mat input_feature_vector(input_array);
    
            Mat projection_result;
    
    
            PCA pca(input_feature_vector,Mat(),CV_PCA_DATA_AS_ROW, 0);/////error memory access
    
            pca.project(input_feature_vector,projection_result);
    
            for(k=0;k<feature_vector_size;k++)
            {
    
               fprintf(pca_output_file,"%lf ",projection_result.at <float>(k,0));
    
    
            }
    
                     fprintf(pca_output_file,"\n");
            input_array.clear ();
    
        }
    .............
    
    }
    Last edited by nihad; March 23rd, 2013 at 11:05 PM.

  2. #2
    Join Date
    Dec 2012
    Location
    England
    Posts
    2,264

    Re: How can I calculate PCA?

    In cases like this, there is a little known but extremely effective set of steps used by gurus to deal with the situation.

    The steps are
    1) Use the debugger to find the problem
    2) Find the problem using the debugger
    3) Follow all the steps
    All advice is offered in good faith only. You are ultimately responsible for effects of your programs and the integrity of the machines they run on.

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