I can't plot two lists as histograms as different colors on the same plot. Hist wants 'Numeric Input'

Using R2017a. Trying to graph two lists (numeric arrays) on the same histogram in different colors. I've written:

idx1 = GSSum > manual_threshold

list1 = GSSum(idx1)

idx2 = GSSum < manual_threshold

list2 = GSSum(idx2)

H1 = hist(list1, 'Facecolor', [0.7 0 0.7])

hold on

H2 = hist(list2, 'Facecolor', [ 0 0.9 0])

Error given is: Error using hist (line 48) Input arguments must be numeric.

Answer 1

[Duncan Po]

What does class(list1) return? If it returns anything other than a builtin numeric class, that would be the reason for your error.