Assign values to a structure using App designer

Question

ZC Song 2019-4-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/456824-assign-values-to-a-structure-using-app-designer

回答： mansour torabi 2021-10-1

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.

My input in the app is:

How to make it to a number?

thanks a lot!

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Answer 1

Dennis 2019-4-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/456824-assign-values-to-a-structure-using-app-designer#answer_370999

在 MATLAB Online 中打开

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

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ZC Song 2019-4-18

在 MATLAB Online 中打开

I deleted those edit fields and reset as below:

        BC.K_sat     = app.K_satEditField.Value;
        BC.lambda = app.lambdaEditField.Value;
        BC.hs     = app.hsEditField.Value;
        BC.theta_res   = app.theta_resEditField.Value;
        BC.theta_sat   = app.theta_satEditField.Value;

and this time it works: