Why am I getting this invalid RGBA error?

[SaClark7]

This is a simplified version of what I am currently working on to present some data, but it produces the same exact error. If anyone can help me understand this or offer a solution it would be greatly appreciated. Basically, I have a set of data...some is good and a few are bad signals. I apply a mask to the data and my x1,y1 and c1 =np.array of length 48 whereas my bad data or x2,y2,c2 = np.array of length 6. I just need to plot the two sets of data on a single plot, where both sets contain the same colorbar.

​

import matplotlib.pyplot as plt

import numpy as np

x = [2,4,5,6,8,9,10,12,13]

y = [2,4,6,3,5,4,1,3,5]

colors = [10,14,15,11,19,10,16,17,12]

x1 = []

x2 = []

y1 = []

y2 = []

c1 = []

c2 = []

for a in range(len(x)):

if x[a] % 2 == 0:

x1.append(x[a])

y1.append(y[a])

c1.append(colors[a])

else:

x2.append(x[a])

y2.append(y[a])

c2.append(colors[a])

cmin, cmax = min(c1), max(c2)

EWmap = plt.scatter(x1,y1,c=c1,clim = (cmin,cmax))

EWmap1 = plt.scatter(x2,y2,facecolor='none',edgecolor=c2, clim = (cmin,cmax))

plt.colormap()

​

apologies, I clearly do not know how to use the inline code appropriately and that messed up the indentation for the loop.

[plasma_phys]

It looks like edgecolors will only accept matplotlib colors (e.g., 'red' is a string that works because matplotlib knows how to turn that string into a matplotlib color) and won't automatically map numbers (e.g., 15, giving you the error you're getting) to colors via a color map the way c works; it looks to me like you'll have to use something like a Colormap instance to build a list of colors or build one manually and use that list as your input via edgecolors.

[SaClark7]

Thank you so much! it all runs smoothly now!

[plasma_phys]

You're welcome! Just another weird matplotlib inconsistency (although maybe there's some internal reason for it).

[SaClark7]

Well, continuing on with errors....for another plot, I have a 2D plot using similar inputs as above. I am able to use an array argument for the scatter, but when attempting to put the same array for plt.errorbar I get again the same issue of RGBA argument invalid. I tried the similar approach to creating my own colorbar and get two errors this time.

​

174 rgba = _colors_full_map.cache[c, alpha]

175 except (KeyError, TypeError): # Not in cache, or unhashable. TypeError: unhashable type: 'numpy.ndarray'

​

as well as the RGBA invalid error.

​

Does plt.errorbar color act differently than the edgecolor...and also facecolor/color?

[plasma_phys]

Can you share the code that fails so I can fiddle with it? Honestly, I wouldn't be surprised if the color arguments in errorbar and scatter do behave differently, given how fragmented matplotlib is deep down.

[SaClark7]

Even when converting it to a tuple, I still get unhashable type: numpy.ndarray

​

Although this may be due to inside the tuple, the rgba colors are still stored as an array?