Using a variable in a function before it is defined.
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I'm trying to create variables defined as the operations they perform at the specific iteration in the for loop; however, I am unsure how to define them before the iteration (i) is used.
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Image Analyst
le 22 Mar 2020
Why do you think it should know what "i" is at that point in your code? You never said what i is, so it's undefined.
I think you want something like
fpbackward = y(2:end) - y(1:end-1)/h;
(but I don't think you even want that, but whatever...that's what you wrote). That will take the prior elements and divide them by the scalar h and subtract them from the latter elements.
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