Error code in gui

Hi, i wanted to calculate between 3 textbox. and i have created this code. However, i have some error. and i cant figure out.

Code:

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p = str2num(get (handles.load, ' String'));

d = str2num(get (handles.diameter, ' String'));

n = str2num(get (handles.fringe, ' String'));

f = ( (8 * p ) / (pi * d * n) );

set(handles.result, 'String', f);

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The error:

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??? Error using ==> get There is no ' String' property in the 'uicontrol' class.

Error in ==> New>calculationPushbutton_Callback at 387 p = str2num(get (handles.load, ' String'));

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> New at 42 gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)New('calculationPushbutton_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

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PLEASE HELP ME!!!

Thanks!

Answer 1

[Pedro Villena]

The sintaxis is good, but you left a space in the beginning of ' String'. Just erase the space blank that is before String

Fail code:

p = str2num(get (handles.load, ' String'));
d = str2num(get (handles.diameter, ' String'));
n = str2num(get (handles.fringe, ' String'));

Correct code:

p = str2num(get (handles.load, 'String'));
d = str2num(get (handles.diameter, 'String'));
n = str2num(get (handles.fringe, 'String'));

[Walter Roberson]

Good catch, I didn't notice that.

The String property for a pushbutton is the label that will be used for the button, and would not usually be a numeric value. You need to be careful, though, as str2num() will take in a string and eval() it to try to get a number.