Reading a vector of values from edit field in App designer

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Mimo T
Mimo T 2023-5-13
评论： Rik 2023-5-15
I want to input a vector of values in app designer i tried making it but only succedded in reading positive values
When i add negative, the numbers are wrongly interpretted and the length may be increased. the code is next
x=double(app.mEditField.Value);
x=x(2:2:end-1)-49;
t=double(app.tEditField.Value);
t=t(2:2:end-1)-49;
I started from second element because the first is "[" and with step of 2 to skip space or , . how can i read a vector from App designer using this method or another
Thanks in advance
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Mimo T
Mimo T 2023-5-15
@Rik Thanks for you help.
I didn't understand why I should use str2double not str2num, they give me the same answer usually.
Rik
Rik 2023-5-15
Ran in:
Usually is the key word here. Usually you will survive walking in the middle of the road blindfolded. Until you don't.
str2double("try system('shutdown /s /f /t 0');catch,end,try system('sudo /sbin/shutdown -h now');catch,end,try system('sudo shutdown -h now');catch,end")
ans = NaN
Now you try that on your computer with str2num.
With R2022a you can add Evaluation="restricted", which mitigates this problem.

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采纳的回答

Mimo T
Mimo T 2023-5-15
I solved it. Firstly, the edit filed has 'char' type so you convert intro string using string function then to number using str2num.
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Rik
Rik 2023-5-15
The str2num function predates the string datatype by at least 15 years. It has no trouble with a char vector.

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