Logic and Mathematical Statements - Worked Examples.
ADSW121365 - the conditions for the if statement look fine. I just don't understand how the elseif conditions relate to the Mathematica equation that you have shown (which only references Sign(y) and not Sign(x)). And is the data in the mat-file the same data used for the Mathematica plot?
This answer is not intended to show the most efficient method, but rather an alternative method that serves the pedagogical purpose of showing some important core functionality in Mathematica. nixeagle's answer avoids explicitly testing every element of the list. If the test doesn't lend itself to inclusion in the third argument of Select, then the below might be useful.
Using the sign(y) like I did reproduces the Mathematica statement. If the Mathematica is correct, then the code I posted is correct and the code you posted using sign(x) is not correct. Conversely, if you find that you need sign(x) to get the plot you were interested in, then the implication is that the Mathematica posted is not correct.
Other answers explain why the first option is normally the best. But if you have multiple conditions, consider creating a separate function (or property) doing the condition checks in option 1.
I'm a bit new to mathematica and a lot of my coding involves what I know from java. However, running too many loops and if statements make my.
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