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** add_mat(): Add matrices a and b into c for n rows and m columns
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void add_mat(double **a, double **b, double **c, int n, int m)
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for (i=0; i < n ; i++) {
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for (j=0; j < m ; j++) {
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c[i][j] = a[i][j]+b[i][j];
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for (i=0; i < n; i++) {
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for (j=0; j < i; j++) {
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c[i][j] = a[i][j]+b[i][j];
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c[j][i] = a[j][i]+b[j][i];
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c[i][i] = a[i][i]+b[i][i];