Adding Polynomials Using App Designer

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jinji gneiss
jinji gneiss 2022-7-18
评论： jinji gneiss 2022-7-23
I am new to matlab and I am trying to create a calculator that adds polynomials. I want the user to input something like 3*x+1 and 4*x+1 and have a result of 7*x+2. here is my code but when I try it, it does not display any answer:
% Button pushed function: AddButton
function AddButtonPushed(app, event)
a = str2num(app.fxEditField.Value);
b = str2num(app.gxEditField.Value);
res = a+b;
app.ResultEditField.Value = num2str(res);
end

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采纳的回答

Kevin Holly
Kevin Holly 2022-7-20
Ran in:
How did you want your user to input the data? As for the calculations, see below for an example.
app.fxEditField.Value = [3 1];
app.gxEditField.Value = [4 1];
AddButtonPushed(app)
a = 
b = 
res = 
app = struct with fields:
fxEditField: [1×1 struct] gxEditField: [1×1 struct] ResultEditField: [1×1 struct]
function AddButtonPushed(app, event)
a = poly2sym(app.fxEditField.Value)
b = poly2sym(app.gxEditField.Value)
res = a+b
app.ResultEditField.Value =res
end
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Kevin Holly
Kevin Holly 2022-7-23
Ran in:
Please see app attached.
app.fxEditField.Value = '3*x+1';
app.gxEditField.Value = '4*x+1';
AddButtonPushed(app);
res = 
ResultEditField_Value = '7*x + 2'
Below is the callback for the "Add" button.
function AddButtonPushed(app, event)
a = str2sym(app.fxEditField.Value);
b = str2sym(app.gxEditField.Value);
res = a+b;
app.ResultEditField.Value = char(res);
end
jinji gneiss
jinji gneiss 2022-7-23
This is exactly what I am looking for! Thank you very much I got it working already. My mistake was I didn't consider char(res).

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