清空筛选条件
清空筛选条件

Replacement for for loops

3 次查看（过去 30 天）
Dhananjay Mishra
Dhananjay Mishra 2018-10-12
评论： Star Strider 2018-10-12
Hello everyone. I want to construct an array of data which will contain values like below example. Any suggestions on how to do this without using for loop will be very helpful. Thank you!
A = zeros();
x1 = 1
for u = -1:1:1
for v = -1:1:1
A(x1) = exp((-1i*(u-v).^2)/2);
x1 = x1+1;
end
end

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2018-10-12
Try this:
[U,V] = meshgrid(-1:1);
Am = exp((-1i*(U-V).^2)/2);
A = Am(:).';
It produces the same output as your code.
  2 个评论
Dhananjay Mishra
Dhananjay Mishra 2018-10-12
Many thanks for your answer. However how to remove for loop if I have a code like this: I am new to MATLAB hence having problems implementing the code
x1=1;y1=1;u1=1;v1=1;
for u = -1:1:1
for v = -1:1:1
for x = -1:1:1
for y = -1:1:1
value(x1,y1) = exp( ( -1i*(((u-x)^2) + (v-y)^2))
y1 = y1+1;
end
x1 = x1+1;
y1 = 1;
end
x1 = 1;
v1 = v1 + 1;
end
u1 = u1+1;
v1 = 1;
end
Star Strider
Star Strider 2018-10-12
As always, my pleasure.
I cannot understand what you want to do. If your code produces the result you want, just leave it as is. I doubt it can be vectorised.
Also, there are too many parentheses in your ‘value’ assignment, so it throws an error. I eliminated one left parenthesis to make it work:
value(x1,y1) = exp(-1i*((u-x)^2 + (v-y)^2))

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by