Convert a simple C code to matlab

Can you help to change this simple C code to matlab?

#include <math.h>
#include <stdio.h>
#include <stdlib.h>

main(int argc, char **argv)
{
   int    nInputs;
   double X1, X2, X3, X4, Y;
   FILE   *fIn  = fopen(argv[1], "r");
   FILE   *fOut;

     if (fIn == NULL)
     {
        printf("Simulator ERROR - cannot open in/out files.\n");
        exit(1);
     }
     fscanf(fIn, "%d", &nInputs);
     fscanf(fIn, "%lg", &X1);
     fscanf(fIn, "%lg", &X2);
     fscanf(fIn, "%lg", &X3);
     fscanf(fIn, "%lg", &X4);
     Y = 1.0 + 2 * X1 + 3.5 * X2 + 3.5 * X3 + 5 * X4;
     Y += 6 * X1 * X1 + 7.5 * X1 * X2 + 7.5 * X1 * X3 + 9 * X1 * X4;
     Y += 10.5 * X2 * X2 + 11 * X2 * X3 + 13 * X2 * X4;
     Y += 10.5 * X3 * X3 + 13 * X3 * X4 + 15 * X4 * X4;

     fOut = fopen(argv[2], "w");
     fprintf(fOut, " %24.16e\n", Y);
     Y = 10 + 11 * X1 + 12.5 * X2 + 12.5 * X3 + 15 * X4;
     Y += 14 * X1 * X1 + 7 * X1 * X2 + 7 * X1 * X3 + 3 * X1 * X4;
     Y += 4 * X2 * X2 + 8 * X2 * X3 + 5 * X2 * X4;
     Y += 4 * X3 * X3 + 5 * X3 * X4 + 2 * X4 * X4;
     fprintf(fOut, " %24.16e\n", Y);

     fclose(fOut);
  }

Answer 1

[Abhiram Bhanuprakash]

Hi H-H,

I am sorry I cannot write the code for you, but I can point to to some MATLAB functions I know which could achieve what you are looking for:

1. You need not include header files in MATLAB.

2. Instead of main() function, you can define a function in MATLAB. For more info on MATLAB functions, refer this

3. You need not declare variables in MATLAB. MATLAB creates it on-the-go.

4. You need not use pointers for file operations. You can use fread , fscanf, fwrite and a host of other Low-Level File I/O functions described here

5. For the if-else construct, use if-else in MATLAB

6. As a substitute for the 'C' function 'fprintf', you can use input. Similarly, as a substitute for the C function 'fprintf', you can use disp.

7. You cannot use the syntax '+=' in MATLAB. For a += b; you need to explicitly use

a = a+b

If you need anything more on this you can just comment on this thread, and I would be glad to help.

Hope this helps,

Cheers!

Abhiram.