How to create vectors in the for loop

Question

0 个投票

I have a hard time understanding the logic behind the for loops, so here is the question:

I have a vector:
A = [5 8 1 4 9 2];

for each value of A, I need to create other vectors in the format B = linspace(-A,A,47), so the output looks as follows:

B(1) = -5 -4.78 -4.56 ... 4.56 4.78 5
B(2) = -8 -7.65 - 7.3 ... 7.3 7.65 8
.
.
.
B(6) = -2 -1.91 -1.83 ... 1.83 1.91 2

Thank you!

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Answer 1

Elias Gule 2017-7-13

1 个投票

Try this.

B = arrayfun(@(x) linspace(-x,x,47),A,'uni',false); % B is a cell array of vectors

Using a for loop:

len = length(A);
B   = cell(len,1);
for index = 1 : len
    B{index} = linspace(-A(index),A(index),47);
end

Yerzhigit Bapin 2017-7-14

Thanks, this works, but is there a way to do it in a matrix rather than cell? I guess nested for loop will be required for that?

Answer 2

Andrei Bobrov 2017-7-13

编辑：Andrei Bobrov 2017-7-14

0 个投票

n = 47;
nn = n - 1;
B = A(:)*2/nn*(0:nn) - A(:);              % R2016b or later
B = bsxfun(@minus,A(:)*2/nn*(0:nn),A(:)); % R2016a or earlier

Andrei Bobrov 2017-7-14

编辑：Andrei Bobrov 2017-7-14

I'm fixed (2).