How to write a for loop as a condition of a while loop in MATLAB?

Question

First of all, I am really new to MATLAB so I'm not sure how to create multiple concurrent conditions for executing a while loop. I have a1(i)x + a2(i)y ≤ b(i) for i = 1, . . ., 16 and when this statement is true, it will execute, for example x=x+1. I have tried to code for that idea:

while (for i=i:16
      a1(i)*x + a2(i)*y < b(i);
       end)
   x=x+1;
end

But of course, that code is wrong, I just want to make the whole for loop as the condition of the while loop. So how can I fix my code to do that? Thank you!

It's rather unclear what you want the code to do. Could you please edit the question to provide a more thorough explanation, preferably with a minimal reproducible example, i.e. include sample input and output. Yes, you can wrap loops in loops, something like while x<3; for ii=1:3; a(ii) = ii;end;x=x+1;end works fine. — Adriaan
– Adriaan, Commented Nov 24, 2020 at 9:40
It looks like you could use while true; for ii = 1:16 (...); if <condition>; break;end;end;x=x+1;end; take a look at the documentation page of break. — Adriaan
– Adriaan, Commented Nov 24, 2020 at 9:48

Wolfie · Accepted Answer · 2020-11-24 11:20:13Z

2

You want to use all or any, depending on your desired output

while any( a1 * x + a2 * y < b )
    x = x + 1;
end

% or

while all( a1 * x + a2 * y < b )
    x = x + 1;
end

Read up on vectorisation to see why you can usually avoid loops in MATLAB

answered Nov 24, 2020 at 11:20

Wolfie

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