Convert Matrix to Vector in Simulink

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Fabian Gock 2017-7-31

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https://ww2.mathworks.cn/matlabcentral/answers/350943-convert-matrix-to-vector-in-simulink

评论： Honglei Chen 2017-7-31

I want to convert a matrix like:

m= [t1 v1
    t2 v2
    t3 v3
    t4 v4]    
(where t are values representing the time and v are the actual values)

into a vector

v=[v1
   v2
   v3
   v4]

attempts using the selector block failed, because I don't really know how to use it, and the documentation is not really clear to me.

I also tried using a Matlab code block.

   function [voltage, current] = matrix2vector(u, i)
   u(:,2)=[];
   i(:,2)=[];
   voltage = u;
   current = i;

and

    function [voltage, current] = matrix2vector(u, i)
    voltage = u(:,2);
    current = i(:,2);

But i get the error: Index expression out of bounds. Attempted to access element 2. The valid range is 1-1. More information

Function 'MATLAB Function' (#35.83.84), line 4, column 15: "2"

Thank you in advance -Fabian

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Fabian Gock 2017-7-31

I don't have the DSP System Toolbox. So I can't use the Variable Selector..

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Answer 1

Honglei Chen 2017-7-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/350943-convert-matrix-to-vector-in-simulink#answer_276174

You should be able to use Selector to do it. In your dialog,

set Number of input dimensions to 2 set Index mode to one based set the first dimension as Select All set the second dimension as Index vector (dialog) and then enter 2

I've attached a snapshot for your reference. Does it address your issue?

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Fabian Gock 2017-7-31

编辑：Fabian Gock 2017-7-31

Thank you for your quick answer. I tried your suggested way but I got the following error

Maybe it is important to know that the matrix i want to convert is imported from the Workspace using a From Workspace block.

Honglei Chen 2017-7-31

This means that you don't have a matrix. Rather you only have a column vector at the selector input. Maybe what you get is already the value itself? Unless you provide more info regarding how the original input is organized and how the from Workspace is configured, it's hard for others to guess what the issue might be.

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Convert Matrix to Vector in Simulink

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