Empty plot without error when swapping axis in compare + interpolate mode

[olivhoenen]

This is a follow-up of #76, using the state compare-issueIbexState.json.

Main use case now works (very slow but this is a different topic):

It just seems to have a problem when swapping axis (time in x instead of rho_tor_norm): this shows the first rho_tor_norm=0 ok

but other radial points show empty plot. Also note that starting from a single URI, with time as x-axis, it complains with "coordinates do not match or are missing" warning, while I add other one or two URIs with the same electrons/temperature field, while doing the same operations when the x-axis is rho_tor_norm works fine.

Originally posted by @olivhoenen in #99 (comment)

[mfiaudrin-epsyl]

Hello @olivhoenen,

I have checked the data received and the interpolation always return NaN elements in the yData matrix (whether we transpose x/y axis or not). I suppose this issue is more relevant to BE.

@jwasikpsnc, could you please check if anything goes wrong with Olivier's dataset?

However, I have done more tests to ensure the transposition works as expected with the interpolation and I have found a bug: when we transpose axis and then interpolate, the axis transposition is preserved but the data aren't transposed. I create an issue and mark it as ready once it'll be fixed.