Error when using step-command
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Marcus Carlsson
il 25 Set 2020
Commentato: Star Strider
il 25 Set 2020
I want to plot the step response of a transfer function but when I use step() i get an error message. I have tried to paste example-code from the matlab help but I still get error.
This is the example code:
(https://se.mathworks.com/help/control/ref/lti.step.html#d122e120846)
sys = tf(4,[1 2 10]);
step(sys)
The message I get is:
"Unable to use a value of type tf as an index."
Anyone who knows what might be wrong?
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Jon
il 25 Set 2020
I can't reproduce the problem running R2020a Update 3. I get a nice step response plot with those same two commands.
I assume you have tried clearing the workspace first, or reopening MATLAB completely just to make sure that there isn't some other variable assignment confusing things, and then, just type those two lines of code
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Star Strider
il 25 Set 2020
I strongly suspect that you have a variable named ‘step’.
Run this is a script or your Command Window:
which step -all
I suspect the first line will be:
step is a variable.
If so, rename the variable to something else that is relevant to the context.
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Fangjun Jiang
il 25 Set 2020
tf() is supposed to define a Transfer Function. You might have a variable called "tf" or other function called "tf". Do the following and see what are the returns
tf
which -all tf
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