GUI help

% In my GUI I am giving value to T e.g 370 as input , but on debug   mode when I am trying to check T as input this gives me 1X3 char   instead of 1, this causing error in my answer giving three values what   can I add to make the input as single char 
e.g in my code 
T = get(handles.Red_Temp,'string'); where 'Red_Temp' is input string

Answer 1

[Jan]

370 cannot be represented as single char.

'Red_Temp' cannot be the input string, because this is a field in a struct. handles.Red_Temp is the handle of an edit uicontrol. T is the string. This string has 3 characters if it is '370'. To convert is to a number use sscanf:

D = sscanf(T, '%g');

[Nasir Qazi]

where do I add 'D' into my code just after 'T = str2double(get(handles.Red_Temp,'string'));'

[Jan]

I do not know your code, therefore I cannot suggest a valid position.

SSCANF is an alternative to STR2DOUBLE, so you do not need both.

Answer 2

[Matt Kindig]

Are you saying that your GUI requires a double input and not a char input? If so, you can just convert the string to a double, like

T = str2double(get(handles.Red_Temp,'string'))

This will be a 1x1 double matrix.

Answer 3

[Otis]

"get(handles.Red_Temp, 'string')" will return a string. If you expect that string to be a number, e.g. '370', then use the function str2double, which will return the actual number that the string represents:

T = str2double(get(handles.Red_Temp,'string'));

Note: If the entered string does not represent an actual number, str2double will return NaN.