Test interpolation methods fails under Octave

[hagenw]

Running the test_interpolation_methods(1) in the ´validation/` folder fails for the last two plots.

The first issue is the non-supported legend option 'Location','SW'.

By removing this option Octave continues and shows the figures, but they contain only the legend and the following warning message is returned:

warning: axis: omitting non-positive data in log plot
warning: axis: omitting non-positive data in log plot
warning: axis: omitting non-positive data in log plot
warning: axis: omitting non-positive data in log plot
warning: axis: omitting non-positive data in log plot
warning: axis: omitting non-positive data in log plot
warning: opengl_renderer: data values greater than float capacity.  (1) Scale data, or (2) Use gnuplot

[fietew]

For the location of the legend https://github.com/sfstoolbox/sfs-matlab/blob/67d20342d2366c2ea1993d1f23397056f03d7cd6/validation/test_interpolation_methods.m#L250-L251 a compatible value would be 'southwest'

The warnings are related to https://github.com/sfstoolbox/sfs-matlab/blob/67d20342d2366c2ea1993d1f23397056f03d7cd6/validation/test_interpolation_methods.m#L239-L246 The semilogx does not allow f == 0.

[hagenw]

Thanks. To get warnings is not a problem, but the plot is also empty. Is this as well related to f == 0?

[fietew]

I will quickly provide a PR for this.

[fietew]

Thanks. To get warnings is not a problem, but the plot is also empty. Is this as well related to f == 0?

Yes

[fietew]

See #191

[hagenw]

Solved by #191