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How to link functionality of Plot "Linewidth" with Knobvalue in appdesigner Matlab (R2020a)

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taimour sadiq
taimour sadiq on 17 Oct 2020
Commented: Adam Danz on 17 Oct 2020
if we have to variable data
app.a = [1 2 3] % used with property
app.b = [4 5 6] % used with property
we use plot(a,b) and to add line width we use plot(a,b,"LineWidth",2)
now i want to link it with Knob value so end user may set Linewidth while Plotting.
in "Plot" push button callbak i wrote
app.G = app.Knob.Value
then
plot(a,b,"LineWidth",app.G)
but this is not working gives error "values not a numeric Scalor"
Kindly suggest Solution. Thanks

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Accepted Answer

Adam Danz
Adam Danz on 17 Oct 2020
Edited: Adam Danz on 17 Oct 2020
It looks like you're using a discrete knob which returns a character vector in its 'value' property. Here are some options.
1. Convert the discrete knob numeric-string to a number.
value = str2double(app.Knob1.Value);
2. Use a continuous knob which returns a numeric value.

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taimour sadiq
taimour sadiq on 17 Oct 2020
Thanks for ur Answer. Yes i m using discrete knob... ok i will try with continues.. Inform u soon

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