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

sfs-matlab/validation/test_interpolation_methods.m

Lines 250 to 251 in 67d2034

	legend('hrir_1','hrir_2','hrir_{ref}','simple interp','freqdomain interp',...
	'timedomain interp','Location','SW')

a compatible value would be 'southwest'

The warnings are related to

sfs-matlab/validation/test_interpolation_methods.m

Lines 239 to 246 in 67d2034

	f = (0:hrtf.API.N-1)/hrtf.API.N*hrtf.Data.SamplingRate;
	figure
	semilogx(f,db(abs(fft(squeeze(hrir_close(1,1,:))))),'k'), hold on
	semilogx(f,db(abs(fft(squeeze(hrir_close(2,1,:))))),'b')
	semilogx(f,db(abs(fft(squeeze(hrir_close_ref(1,1,:))))),'g')
	semilogx(f,db(abs(fft(squeeze(hrir_close_simple(1,1,:))))),'r')
	semilogx(f,db(abs(fft(squeeze(hrir_close_fd(1,1,:))))),'m')
	semilogx(f,db(abs(fft(squeeze(hrir_close_td(1,1,:))))),'c')

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