如何对八度图中文本字段中存储的val求和

Question

may I ask for help in octave to do summation from textbox by click the button. enclose the form Octave Form

so far my code like this:

MainFrm = figure(
    "position", [500, 500, 400, 200],
    "color", "blue"
);

TxtA = uicontrol (
   "style", "edit",
   "units", "pixels",
   "string", "INPUT VAL1 HERE",
   "position", [10, 100, 150, 38]
);

TxtB = uicontrol (
   "style", "edit",
   "units", "pixels",
   "string", "INPUT VAL2 HERE",
   "position", [200, 100, 150, 38]
 );

TxtC = uicontrol (
    "style", "edit",
    "units", "pixels",
    "string", "RESULT SHOW HERE",
    "position", [200, 50, 150, 38]
);

CmdSumm = uicontrol(
  MainFrm,
  "style", "pushbutton",
  "string", "SUMMATION",
  "units", "pixels",
  "position", [10, 50, 150, 38]
);

function Summation (hObject, eventdata, AddFrame)
  uicontrol(AddFrame);
  TxtC = TxtA + TxtB
end

what I want to do is: user can put value in textbox1 and textbox2. after the user inputed the value on both textbox user click or press the summation button to execute summation proses. the result then show / display in textbox3.

how to do this in octave? thank you for your kind attention.

Answer 1

I'd suggest going through Octave's GUI documentation again. While not necessarily as comprehensive as they could be, there's a few things there that would have gotten you further along.

• First issue: your Summation function lacks references to the edit box objects, so it can't get the values
• Second issue: your pushbutton has no callback , so clicking it won't do anything
• Third "issue": No idea what AddFrame is, or why it's an input to Summation

For the first issue, you'll want to use a function like guidata to store the handles to your graphics objects in a way that is accessible by the rest of the UI. To do so, store the outputs of your UI object creation calls to a structure, then save that structure to your main figure for later use. You can obtain the structure with another call of guidata

For the second issue, you need to specify Summation as the callback function for your pushbutton so it is executed on button press.

The updated code would look something like this:

function aGUI()
h.MainFrm = figure(
    "position", [500, 500, 400, 200],
    "color", "blue"
);

h.TxtA = uicontrol (
   "style", "edit",
   "units", "pixels",
   "string", "INPUT VAL1 HERE",
   "position", [10, 100, 150, 38]
);

h.TxtB = uicontrol (
   "style", "edit",
   "units", "pixels",
   "string", "INPUT VAL2 HERE",
   "position", [200, 100, 150, 38]
 );

h.TxtC = uicontrol (
    "style", "edit",
    "units", "pixels",
    "string", "RESULT SHOW HERE",
    "position", [200, 50, 150, 38]
);

h.CmdSumm = uicontrol(
  h.MainFrm,
  "style", "pushbutton",
  "string", "SUMMATION",
  "units", "pixels",
  "position", [10, 50, 150, 38],
  "Callback", @Summation
);

guidata(h.MainFrm, h)
end

function Summation(hObject, eventdata)
h = guidata(hObject);
C = str2double(get(h.TxtA, 'String')) + str2double(get(h.TxtB, 'String'));
set(h.TxtC, 'String', C)
end

Which functions as desired.

While not specifically Octave, I'd also recommend checking out MATLAB's UI documentation . It's fairly comprehensive and the syntax should be more or less equivalent to what you'd find in Octave.