setting decimal point precision in handles.object

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?

Answer 1

[Fangjun Jiang]

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)

[Fangjun Jiang]

actually, the opposite of str2double(), num2str(), can do that doo.

num2str(pi,'%.2f')

ans = '3.14'