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

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taimour sadiq 2020-10-17

评论： Adam Danz 2020-10-17

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

Adam Danz 2020-10-17

编辑：Adam Danz 2020-10-17

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 2020-10-17

编辑：taimour sadiq 2020-10-17

Method 2 is Working... Thanks Again Dear

Adam Danz 2020-10-17

Good choice!

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