How can I get the variable from inside of the for loop and use it /display it after for loop?

Hi,

I created a for loop. Inside this for loop I calculated a variable. Unfortunately Matlab deletes the variable after the end of the for loop. How can I use the calculated variable outside of the for loop? Thanks!

[Azzi Abdelmalek]

post your code

Answer 1

[Azzi Abdelmalek]

That depends where your loop is, in script file or function file If it's in Function file, that have nothing to do with a loop , you declare your variable global, If it's in the script file, your variable can't be deleted. look at these examples

for k=1:10
x=sin(k)
end

the result is x=sin(10); the previous x where erased, if you want to save them

for k=1:10
x(k)=sin(k)
end

[Simon]

Ah, okay. My loop is in a function file. So I have to declare it as global. Thanks for your explanation!

[Arthur]

In a function it's better to return is as a variable. Easier and saver.

function x = myLoop()
for k=1:10
x(k)=sin(k)
end

[Simon]

Ok, thanks. Now it works without globals!

Answer 2

[Sachin Ganjare]

Declare that variable as global, so that matlab won't delete it.

[Sachin Ganjare]

Refer below link:

http://www.mathworks.in/help/matlab/ref/global.html

[Simon]

I wanted to avoid declaring the variable as global. If its the only way to use a variable outside of the for loop, then I have to do it. But thanks for your answer!

[José-Luis]

No it's not. It's a bad idea. Don't use globals. Have the function return the variable instead.

[Azzi Abdelmalek]

I don't agree with systematic, it's bad to use globals