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Asked: 2026-06-01T14:34:45+00:00

I have 2 uni-dimentional arrays in workspace, one (xarray) is to be used as

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I have 2 uni-dimentional arrays in workspace, one (xarray) is to be used as the x-axis and the other (yarray) as the y-axis.

xarray =

     1     2     3     4     5     6     7     8     9    10

yarray =

   500   200   800     0     0     0     0     0     0     0

What I want to do in Simulink is to read these arrays from the workspace and generate a X-Y graph. I can easily do that from the Matlab command-line (figure; plot(xarray, yarray)), however, I want to do it from Simulink.

I’ve tried to read each array from workspace by using two “for workspace” blocks which I then connected to the corresponding inputs of a ‘X-Y graph’, however, the error I got was:

Error in port widths or dimensions. Output port 1 of
‘simulink_model/XY Graph/Mux’ is a one dimensional vector with 18
elements.

Any help will be much appreciated, thanks.

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1 Answer

  1. Editorial Team

    simulink can be a bit tricky when using external matrices.

    So a couple of things:
    1) matrices need to have there array as columns (fortunatly you can do the transpose operation in simulink itself)

    2) you need the first column to represt time-entry of the array:
    so in your case, for the first input you can use [xarray; xarray]', and the second input, you can use [xarray; yarray]’ (provided, of course xarray doesn’t change)

    3) don’t forget to modify the scope preferences to see all the data (default maxes to [-1;1])

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