setting decimal point precision in handles.object

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Barak
Barak am 18 Nov. 2022
Bearbeitet: Fangjun Jiang am 18 Nov. 2022
I got some GUIDE GUI thingy that has a editable text field that I send some calculation to it base on user input in another 3 fields (also ediable text boxes.
How do I set that the display will be of 2 point after the decimal point? the standard routine of ('somethng %f.2'. variable) does not work in that case of:
function calcBtn_Callback(hObject, eventdata, handles)
SLa = str2double(get(handles.inputFld1,'String'));
SLb = str2double(get(handles.inputFld2,'String'));
SLc = str2double(get(handles.inputFld3,'String'));
semiPrim = abs((SLa + SLb + SLc) / 2);
area = sqrt(abs(semiPrim*(semiPrim-SLa)*(semiPrim-SLb)*(semiPrim-SLc)));
set(handles.triAreaCalcFld,'String', area); % <-- HOW TO MAKE this a 2 places after decimal precision?

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Fangjun Jiang
Fangjun Jiang am 18 Nov. 2022
Bearbeitet: Fangjun Jiang am 18 Nov. 2022
As you can see, the value for "editable text field" should be string.
You can't do "set(handles.triAreaCalcFld,'String', area)" as "area" is numerical.
You shall do
AreaString=sprintf('%.2f',area);
set(handles.triAreaCalcFld,'String', AreaString)
  1 Kommentar
Fangjun Jiang
Fangjun Jiang am 18 Nov. 2022
actually, the opposite of str2double(), num2str(), can do that doo.
num2str(pi,'%.2f')
ans = '3.14'

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