macOS Maybe its the data.

scale_psf and shift are basically the same routine. Shift is given a 5x5 array; does a spline fit; and spits out values for different shifts.
scale_psf reads a 7x7 array from a 9x9, then does a spline fit, etc.
scale_psf runs. Shift gives an error from subroutine splint.

Bad xa input to routine splint meaning the xa's are supposed to be distinct

Segmentation fault: 11
The data looks good. ideas?

row and col from original array x and y values for fits.

1 1 4.583470e-04 0.000000
2 1 2.077194e-03 1.000000
3 1 5.094325e-03 2.000000
4 1 6.767528e-03 3.000000
5 1 4.821159e-03 4.000000
6 1 1.817393e-03 5.000000
7 1 3.617132e-04 6.000000
1 2 4.277461e-03 0.000000
2 2 1.952928e-02 1.000000
3 2 4.829266e-02 2.000000
4 2 6.475326e-02 3.000000
5 2 4.635365e-02 4.000000
6 2 1.757597e-02 5.000000
7 2 3.521748e-03 6.000000
1 3 1.613505e-02 0.000000
2 3 7.439683e-02 1.000000
3 3 2.058777e-01 2.000000
4 3 3.419473e-01 3.000000
5 3 2.014201e-01 4.000000
6 3 6.890912e-02 5.000000
7 3 1.385475e-02 6.000000
1 4 2.473772e-02 0.000000
2 4 1.157985e-01 1.000000
3 4 4.236829e-01 2.000000
4 4 1.001269e+00 3.000000
5 4 4.291793e-01 4.000000
6 4 1.106424e-01 5.000000
7 4 2.214931e-02 6.000000
1 5 1.544559e-02 0.000000
2 5 7.225405e-02 1.000000
3 5 2.023644e-01 2.000000
4 5 3.419895e-01 3.000000
5 5 2.048718e-01 4.000000
6 5 7.078581e-02 5.000000
7 5 1.441986e-02 6.000000
1 6 3.918950e-03 0.000000
2 6 1.842335e-02 1.000000
3 6 4.690383e-02 2.000000
4 6 6.473467e-02 3.000000
5 6 4.760941e-02 4.000000
6 6 1.853932e-02 5.000000
7 6 3.815576e-03 6.000000
1 7 4.017731e-04 0.000000
2 7 1.902726e-03 1.000000
3 7 4.875838e-03 2.000000
4 7 6.764522e-03 3.000000
5 7 5.018507e-03 4.000000
6 7 1.969349e-03 5.000000
7 7 4.080752e-04 6.000000

willieva said:

Since the code you posted won't compile, the advice I'd offer is:
1) Make sure the 2 files referenced in the code exist and contain what you think they're supposed to.

2) Compile with -g then run the program in a debugger. You'll see what line it's crashing on.

Click to expand...

I know exactly where they are crashing. In the subroutine spline, where the xa's are checked.

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If you want to load the cfitsio library, I'll send you an image.