Initialise a variable which changes sizer each iteration in simulink coder

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Vishal Varadraj 2022-2-1

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https://ww2.mathworks.cn/matlabcentral/answers/1640630-initialise-a-variable-which-changes-sizer-each-iteration-in-simulink-coder

评论： Benjamin Thompson 2022-2-3

How would i go about initialising a variable which changes size each iteration. I've tried three things to get past this

The first being and i got that error which does make sense

powerout = zeros(1,1);

Attempted to access index 2 of an array with smaller dimension sizes. The valid index range is 1 to 1. This error will stop the simulation. In MATLAB Function 'ThermalBatterySimulinkModel/MATLAB Function': powerout(n) = SensiblePower;

The second being this script of code for which i got this error

powerout = zeros(60,1);

Size mismatch (size [60 x 1] ~= size [1 x 1]). The size to the left is the size of the left-hand side of the assignment.

The third being the following which i was not sure how this would work

powerout = zeros(1,1);

coder.varsize('powerout',[1 60]);

'powerout' is inferred as a variable-size matrix, but its size is specified as inherited or fixed. Verify 'powerout' is defined in terms of non-tunable parameters, or select the 'Variable Size' check box and specify the upper bounds in the Size box.

Any idea how i can initialise a variable/get this code working with this variable. I know that I'm running the loop for 60 iterations and I'm storing 60 values and need to output the final value. I have attached a picture by what I mean.

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Vishal Varadraj 2022-2-1

Screenshot 2022-02-01 154810.png

I think powerout is defined inside the simulink model, though i must say that I'm completely new to simulink. I've written my script in MATLAB and trying my best to translate that into a simulink Function so im not sure if thats fully correct or not. Any guidance on how i can find that would be helpful. Below is the screenshot of my code ive put into my function block. I need all 60values of powerout recorded as I will index them later on in the code so rewritting on top of previous isn't an option. I've attached a screenshot of my code and marked it in red by what I mean. Thanks!

Benjamin Thompson 2022-2-3

You do not need to size variables to match the time duration of a simulation. Your S-Function just needs to update the value of all outputs to Simulink at each iteration. Then, connect the output to a "To Workspace" block or use signal logging if you want to save the past values.

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