Questions and discussion for this lecture live here. Fire away by hitting Reply below 
I understand the use of _r to invert the values of the colormap in the situation that all members are in compression, the lesser negative (the biggest value) value has to be the lighter red and the most negative value (the minor value) has to be the darker red, but why we have to use the _r to invert the colormap in the case that all members are in tension ? the lesser positive value (the minor one) has to be the lighter blue and the most positive value (the biggest one) has to be the darker blue. Am I getting something wrong ?
Hey @Pedro_Henrique_Soare - Your intuition for the colourmap is correct - or at least is matches my intuition - larger magnitude numbers get a darker colour. This is what we’re achieving with the colour mapping in this lecture. If you want to get a more complete understanding of the mapping, try inverting the colours (dropping the _r, and observe the behaviour.
S
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