How do I add these two variables? i keep on getting an error.

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Abraham
Abraham 2023-9-9
评论： Walter Roberson 2023-9-10
function AddButtonPushed(app, event)
x =app.Input1.Value;
y =app.Input2.Value;
app.Output.Value = addition(x, y);
end
Error Message I receive
Error using matlab.ui.control.EditField/set.Value
'Value' must be a character vector or a string scalar.
Error using EngrMaeFinal/AddButtonPushed
Undefined function 'addition' for input arguments of type 'double'.

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回答（1 个）

dpb
dpb 2023-9-9
编辑：dpb 2023-9-9
We don't know enough to be complete, but assuming the two input values are numeric, then
function AddButtonPushed(app, event)
x =app.Input1.Value;
y =app.Input2.Value;
app.Output.Value = string(x+y);
end
However, it's quite possible (likely?) you'll need to do a str2double() on the two input values that are also going to be char data in the control.
So, guessing, the function probably ought to look more like
function AddButtonPushed(app, event)
x=str2double(app.Input1.Value);
y=str2double(app.Input2.Value);
app.Output.Value = string(x+y);
end
  2 个评论
Abraham
Abraham 2023-9-9
编辑：Abraham 2023-9-9
+++ I tried implenting your code and it doesnt work out either.
My two inputs are numeric. I am trying to add input1 to input2 and have it appear in the Output box. I am having trouble with my third line of where i cannot add my input1 and input2 because i get an error. Ive tried using the sum operator but i get an error message as well. I dont know the proper operator to add my two inputs.
*** I also get value must be a double scalar error
% Button pushed function: AddButton
function AddButtonPushed(app, event)
x=app.Input1.Value;
y=app.Input2.Value;
app.Output= addition(x,y);
end
Error message
Unrecognized function or variable 'addition'.
Error in EngrMaeFinal/AddButtonPushed (line 26)
app.OutputEditField.Value = addition(x,y);
Error in matlab.apps.AppBase>@(source,event)executeCallback(ams,app,callback,requiresEventData,event) (line 62)
newCallback = @(source, event)executeCallback(ams, ...
Error while evaluating Button PrivateButtonPushedFcn.
Walter Roberson
Walter Roberson 2023-9-10
addition is not a MATLAB function or a method of any Mathworks-provided class that I can find.
You will need to define your own addition function.

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