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

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

Answer 1

[Adam Danz]

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.

[taimour sadiq]

Thanks for ur Answer. Yes i m using discrete knob... ok i will try with continues.. Inform u soon

[taimour sadiq]

Method 2 is Working... Thanks Again Dear

[Adam Danz]

Good choice!