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I need help with for loops

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Mark Woolsey
Mark Woolsey 2020 年 5 月 1 日
コメント済み: Mark Woolsey 2020 年 5 月 1 日
I am new to matlab and I'm writing a for loop that will answer eather true or false whether a number in a vector is positive or negative. ie A = [-5 -3 2 37 -33 6] and answer B = [false false true true false true]. Any advice you may be able to give me?
  4 件のコメント
Mark Woolsey
Mark Woolsey 2020 年 5 月 1 日
It is an asignment that I need to use a for or while loop to answer the question.

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回答 (2 件)

Prasad Reddy
Prasad Reddy 2020 年 5 月 1 日
clc
clear all
A = [-100 20 50 -2 -55 3 40 -27]
B=zeros(1,length(A))
for i = 1:length(A)
if A(i) > 0
B(i) = true
else
B(i) = false
end
end
% This will work. but you will get 1 in place of true and 0 in place of false.
% please give upthumb if this works well.
% i am trying more specifically for your code.
% will update soon once got the answer.

Prasad Reddy
Prasad Reddy 2020 年 5 月 1 日
clc
clear all
A = [-100 20 50 -2 -55 3 40 -27]
for i = 1:length(A)
if A(i) > 0
B(i) = {'true'};
else
B(i) = {'false'};
end
end
B
% This is the final Answer.
% Hear you are trying to crete a string array B, which will have true and false.
% I think this is the only way in which you can do it.
% please provide up thumb if it works. Iworked for this problem for an hour.
  1 件のコメント
Mark Woolsey
Mark Woolsey 2020 年 5 月 1 日
This will work if i remove the (' ') around the true false statements, but i get the answer with 0's and 1's. Is there a way to convert the 0's and 1's to true and false outside the loop?
If i leave this in (' '), I get this responce:
In an assignment A(:) = B, the number of elements in A and B must be the same.

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