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Using i and j as normal variables, such as for loop iterators, is bad.
Here are some discussions
Over the years, Matlab has been redesigned to carry better performance dealing with i and j as workspace variables, but the ambiguity will never go away.
Another ambiguous case about complex numbers in Matlab
About "perceptually non-uniform" colormaps: External link one two
Thanks to Ander Biguri for these references.