Assign values to a structure using App designer

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ZC Song
ZC Song on 17 Apr 2019
Answered: mansour torabi on 1 Oct 2021
Hi, I want to ask a simple question that bothered me a lot.
When I assign values to a struct, like below
BC.theta_res = app.theta_resEditField_3.Value;
BC.theta_sat = app.theta_satEditField_3.Value;
BC.K_sat = app.K_satEditField_3.Value;
BC.lambda = app.lambdaEditField.Value;
BC.h_s = app.h_sEditField.Value;
why they store values as characters not numbers? Each item has a single quote mark on it.
QQ截图20190416221741.png
My input in the app is:
QQ截图20190416221806.png
How to make it to a number?
thanks a lot!

Answers (2)

Dennis
Dennis on 17 Apr 2019
There are two different types of edit fields in appdesigner (numeric and text). In the picture you show are only text edit fields (those are usually left aligned, while numeric fields are right aligned). The value of text edit fields is a string and should be converted to a number before doing calculations with it.
fig=uifigure;
f(1)=uieditfield(fig,'position',[100 50 80 40],'value','1');
f(2)=uieditfield(fig,'numeric','position',[100 90 80 40],'value',2);
s.theta=f(1).Value;
s.lambda=f(2).Value;
f(1).Value+5 %does not throw an error!
str2double(f(1).Value)+5
  4 Comments
ZC Song
ZC Song on 19 Apr 2019
Hi Dennis,
Thank you very much for your attention, I retyped all fields and now they are runing fine!

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mansour torabi
mansour torabi on 1 Oct 2021
Simply just use str2double function:
BC.theta_res = str2double(app.theta_resEditField_3.Value);

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