Error using area plot in App Designer

Question

Elvia Rosas 2020-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/671553-error-using-area-plot-in-app-designer

编辑： Elvia Rosas 2020-12-2

How can I use area plot in App Desiigner. I am using this code to show the area behide the curve of a function, in order to show the integration area.

This is the code:

f = str2func(app.FuncinEditField.Value)

a = app.aEditField.Value

b = app.bEditField.Value

n = app.nEditField.Value

fplot(app.UIAxes,f, [0,10])

hold(app.UIAxes,"on")

x= linspace(a,b)

y = f(x)

area(app.UIAxes,x,y)

I get this error at area(app.UIAxes,x,y) line: Unable to use a value of type matlab.ui.control.UIAxes as an index.

Thank you for your help

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Answer 1

Benjamin Kraus 2020-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/671553-error-using-area-plot-in-app-designer#answer_563103

编辑：Benjamin Kraus 2020-12-2

在 MATLAB Online 中打开

I think you've created a variable with the name area somewhere in your code.

Can you add this code, immediate above the line of code that is calling the area command?

which -all area
whos area

The which command will tell you if there is another file called area shadowing the built-in copy of area, or if area is the name of a variable in your workspace. Look at the first line of output to see if it says "area is a variable."
The whos command will tell you about the variable area if it exists in your workspace.