Assign values to a structure using App designer

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!

Answer 1

[Dennis]

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

[ZC Song]

Thank you for your reply! Yes, there are two types of edit fields, what I'm using is Numeric, I don't know why some results are number while some are string. For example:

    height          = app.HeightmEditField.Value;                    
    slope           = app.SlopeangleEditField.Value;  

'height' and 'slope' are assigned as number, the syntax is the same I think.

[Dennis]

I am pretty sure that the edit fields in your previous screenshot are not numeric.

What do you get as result when you run this:

        BC.theta_res = app.theta_resEditField_3.Type;
        BC.theta_sat = app.theta_satEditField_3.Type;
        BC.K_sat     = app.K_satEditField_3.Type;
        BC.lambda = app.lambdaEditField.Type;
        BC.h_s = app.h_sEditField.Type; 

[ZC Song]

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:

I feel confused about what the difference? why the previous one didn't work.

[ZC Song]

Hi Dennis,

Thank you very much for your attention, I retyped all fields and now they are runing fine!

Answer 2

[mansour torabi]

Simply just use str2double function:

BC.theta_res = str2double(app.theta_resEditField_3.Value);