How can I concatenate matrices in an embedded matlab function block in simulink?

3 次查看（过去 30 天）
Nawal El Boghdady
回答： Mike Hosea 2013-11-2
Hey all;
I wanted to concatenate matrices together in an embedded matlab function block, so i'd like to do something like this:
s.a = [s.a , b];
'a' is a 22x1 matrix, 'b' is also a 22x1 matrix, so in the end i'd like 's.a' to be a 22x2 matrix. The syntax above does not work and gives the following error:
================ Size mismatch (size [22 x 1] ~= size [22 x 2]). The size to the left is the size of the left-hand side of the assignment ================
I tried deleting the field 'a' and then re-adding it again after modifications using the 'remfield' and 'setfield' commands accordingly. However, the 'remfield' command is not supported by code generation, which is what I need in order to run my model on the xPC real-time target machine. Any ideas how I might fix this? Thanks in advance :)
  1 个评论
Kaustubha Govind
Kaustubha Govind 2013-7-10
Typically, you cannot change the size of a variable dynamically inside the MATLAB Function block, since this is not code-generation compatible (the block always generate C code from the MATLAB code for execution). You need to declare variables as variable-size using coder.varsize to allow such constructs.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Mike Hosea
Mike Hosea 2013-11-2
Kaustubha's comment is the answer to this question. Use coder.varsize to give s.a the variable-size properties that you need. For example, if you want to be able to concatenate up to 10 columns, then you could declare
coder.varsize('s.a',[22,10],[0,1]);
or use Inf instead of 10 if you don't know how many columns will be required. That particular coder.varsize line specifies that the number of rows, 22, is not variable.

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 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