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/*=================================================================
 *
 * MATRIX.C Sample driver code that calls a shared library created
 *          using MATLAB Compiler SDK. Refer to the MATLAB Compiler 
 *          SDK documentation for more information.
 *
 * Copyright 1984-2017 The MathWorks, Inc.
 *
 *=================================================================*/

#include <stdio.h>

/* Include the MATLAB Runtime header file and the library specific header file 
 * as generated by MATLAB Compiler SDK. */
#include "libmatrix.h"

/* This function is used to display a double matrix stored in an mxArray */
void display(const mxArray* in);

int run_main(int argc, const char **argv)
{
    mxArray *in1, *in2; /* Define input parameters */
    mxArray *out = NULL;/* and output parameters to be passed to the library functions */
    
    double data[] = {1,2,3,4,5,6,7,8,9};
    
    /* Create the input data */
    in1 = mxCreateDoubleMatrix(3,3,mxREAL);
    in2 = mxCreateDoubleMatrix(3,3,mxREAL);
    memcpy(mxGetPr(in1), data, 9*sizeof(double));
    memcpy(mxGetPr(in2), data, 9*sizeof(double));
    
    /* Call the library intialization routine and make sure that the
     * library was initialized properly. */
    if (!libmatrixInitialize()){
        fprintf(stderr,"Could not initialize the library.\n");
        return -2;
    }
    else
    {
        /* Call the library function */
        mlfAddmatrix(1, &out, in1, in2);
        /* Display the return value of the library function */
        printf("The sum of the matrix with itself is:\n");
        display(out);
        /* Destroy the return value since this variable will be reused in
         * the next function call. Since we are going to reuse the variable,
         * we must set it to NULL. Refer to MATLAB Compiler SDK documentation
         * for more information. */
        mxDestroyArray(out); 
        out=0;
        mlfMultiplymatrix(1, &out, in1, in2);
        printf("The product of the matrix with itself is:\n");
        display(out);
        mxDestroyArray(out); 
        out=0;
        mlfEigmatrix(1, &out, in1);
        printf("The eigenvalues of the original matrix are:\n");
        display(out);
        mxDestroyArray(out); 
        out=0;
        
        /* Call the library termination routine */
        libmatrixTerminate();
        
        /* Free the memory created */
        mxDestroyArray(in1); 
        in1=0;
        mxDestroyArray(in2); 
        in2=0;
    }

    /* Note that you should call mclTerminateApplication at the end of
     * your application.
     */
    mclTerminateApplication();
    return 0;
}


/*DISPLAY This function will display the double matrix stored in an mxArray.
 * This function assumes that the mxArray passed as input contains double
 * array.
 */
void display(const mxArray* in)
{
    size_t i=0, j=0; /* loop index variables */
    size_t r=0, c=0; /* variables to store the row and column length of the matrix */
    double *data; /* variable to point to the double data stored within the mxArray */

    /* Get the size of the matrix */
    r = mxGetM(in);
    c = mxGetN(in);
    /* Get a pointer to the double data in mxArray */
    data = mxGetPr(in);
    
    /* Loop through the data and display it in matrix format */
    for( i = 0; i < c; i++ )
    {
        for( j = 0; j < r; j++)
        {
            printf("%4.2f\t",data[j*c+i]);
        }
        printf("\n");
    }
    printf("\n");
}

int main(int argc, const char ** argv)
{
    /* Call the mclInitializeApplication routine. Make sure that the application
     * was initialized properly by checking the return status. This initialization
     * has to be done before calling any MATLAB APIs or MATLAB Compiler SDK
     * generated shared library functions.  */
    if( !mclInitializeApplication(NULL,0) )
    {
        fprintf(stderr, "Could not initialize the application.\n");
        return -1;
    }
    return mclRunMain((mclMainFcnType)run_main, argc, argv);
}