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Just wondering... Why have you used a structure of arrays rather than an array of structures?

Switching to an array of structures would reduce the length of that program by at least 30 lines of...

I specifically quoted that part because of the fact that you were using a different variable for the indexing as was being altered in the loop.

There's nothing really weird or wrong about using a...

This doesn't look right either:

for (i = a; i < b-1; ++i)
fprintf(ofp,"%lf, %lf, %lf, %lf \n", tmp.t[iiii], tmp.x[iiii],tmp.y[iiii], tmp.z[iiii]);
You know you've got a problem when you've...