Simulink Error "Attempt to extract field 'p1' from 'mxArray'"

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Dave Russell
Dave Russell 2021-11-4
回答： Jere Knuutinen 2024-8-6
I'm creating a parabolic curve fit then trying to send the parameters to another function block. It works in Matlab, but when I put it into function block
function coefficients = my_block(Start, Steps, Setpoint)
coder.extrinsic('fit');
%#codegen
coefficients = [0;0;0];
x = [0; Steps; Steps*2];
y = [Start; Setpoint; Start];
f = fit(x,y,'poly2');
coefficients(1) = f.p1;
coefficients(2) = f.p2;
coefficients(3) = f.p3;
I get the error above. Simple fix?

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回答（2 个）

Swatantra Mahato
Swatantra Mahato 2021-11-8
Hi Dave,
The output of the extrinsic function 'fit' would be an mxArray, which is likely leading to the error when trying to extract 'p1' in the line
coefficients(1) = f.p1;
You can refer to the following link to work with output of an extrinsic function
https://www.mathworks.com/help/coder/ug/use-matlab-engine-to-execute-a-function-call-in-generated-code.html#bq1h2z9-46
Hope this helps
Jere Knuutinen
Jere Knuutinen 2024-8-6
Did you find solution for this problem?

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