Hi guys, I have the following problem, I have a “Do” loop, like Do[ expression1; If[ "....." ,PutAppend[{...},"list"]],{100}] In this case, it sees if the expression satisfies the condition inside the If, and if it does, it put it inside a list, if it does not, it just keeps going for another ro…

Filipe, There are many ways to do something like this. Please provide a simple, working example. It’s difficult to help you without understanding exactly what you want. Regards

Filipe, Maybe this will help a little, it basically does another Do loop if the number is odd. listodd = {}; listeven = {}; Do[ If[OddQ[i], AppendTo[listodd, i]; Do[Print["This is and odd number", " -> ", i], {y, 1, 2}], AppendTo[listeven, i]], {i, 1, 10}]; Print[listodd]; Print[listeven] R…

Paul, what would be the job of the variable “y” here?

From this and your earlier post I assume that you have a set of expressions in a file. And you want to take, from that file, those expressions which fulfills both of two conditions. Am I right? If so it could be convenient to use the function Select: file = Range@1000; Select[file, Divisible[#, 3]…

Hans, from the first Do loop I store a set of values for those parameteres, those ones that satisfy the conditions. As you can see, I have no data in the list since I get the data from the fisrt Do loop. The first Do runs from 1 to n, where n can be any number depending on how many data I wanna coll…

Felipe, could you give a skeleton example of how you now do it with the two Do loops? Numerical and simple.

I will try Hans. Here we go Do[ m={{a1,a2},{a3,a4}}; (*2x2 matrix*) a1 = RandomReal[{0, 1.}]*RandomChoice[{-1., 1.}]; a3 = RandomReal[{0, 1.}]*RandomChoice[{-1., 1.}]; a2 = RandomReal[{0, 1.}]*RandomChoice[{-1., 1.}]; a4 = RandomReal[{0, 1.}]*RandomChoice[{-1., 1.}]; If[a1>a2 && a3>a4,PutAppend[{a1…

Do[Print[“This is and odd number”, " → ", i], {y, 1, 2}] Is your second Do loop, the ‘y’ is just how many times you want it to loop, you can set that value from the first loop. You can use the values of {a1, a2, a3, a4 and m} in this loop. When it has finished clear all the values and go back to …

Sorry Felipe, but this is not simple enough for me :slight_smile: And the second Do loop throws errors. Even after correcting some obvious typos/omissions.

How can I connect two Do[ ] loops?

Questions

felipevillazon98 (Felipe Villazon) June 5, 2021, 11:12am 3

Neil, I hope you are doing well.
Here I posted the same question but with a code to understand in a better way what I really wany to my code to do and what it is doing actually.

Sadly I have not had luck trying to solve it. I hope you can understand the idea.

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How can I connect two Do[ ] loops?

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