Setting variable to zero with conditional statement?

6 次查看（过去 30 天）
matlabkid602
matlabkid602 2017-11-19
编辑： matlabkid602 2017-11-19
I'm writing a for loop which runs through values and sometimes the element that the loop selects is outwith the vector length.
For example, say I have a vector of 10 entries and the loop asks for the 11 "th" entry it doesn't exist so I get an error.
How do I put this in the code with an if statement? I want the code to go like:
%the loop selects y(n)
if n>10 then set y(n) = 0
else y(n) = y(n)
Sorry if it's unclear, I'm sure it's a simple fix?

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2017-11-19
if n>length(y); y(n) = 0; end
  3 个评论
显示 1更早的评论
Walter Roberson
Walter Roberson 2017-11-19
If I understand correctly, for negative shift you would like to set array locations with negative indices? That is not permitted in MATLAB. Do you want negative shift to be interpreted as starting from the maximum value, with n = -1 being interpreted the same as y(end) and n = -2 being interpreted the same as y(end-1) ?
matlabkid602
matlabkid602 2017-11-19
编辑：matlabkid602 2017-11-19
If I choose k such that somewhere during the loop "shift" becomes negative, or greater than the length of y, I want y(shift) = 0.
I'm solving ODE's with the loop and need this condition.

请先登录，再进行评论。

类别

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

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by