Plotting multiple graph on 1 axes GUI

Hello to everyone, I have got an *.xlsx database, which refreshes each 20 sec and add some rows of data. I need to make a GUI to make some temp-time graph, with an ability of making multiple graphs on one axes. How can I do this? I don'tknow anything about MATLab, I tried like here http://blogs.mathworks.com/videos/2007/08/13/video-series-reading-excel-data-into-matlab-with-a-gui/. But by the help of this it can plot just 1 graph, but there are N arrays of values for y-axis, and just 1 for x. Please, help me if you are able. here is the code

function varargout = mainGUI(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @mainGUI_OpeningFcn, ...
                   'gui_OutputFcn',  @mainGUI_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
function mainGUI_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);
function varargout = mainGUI_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;

function pushbuttonLoadXLS_Callback(hObject, eventdata, handles)
handles.fileName=uigetfile('*.xls')
guidata(hObject, handles)
setPopupmenuString(handles.popupmenuX, eventdata, handles)
setPopupmenuString(handles.popupmenuY, eventdata, handles)
set (handles. popupmenuX, 'callback','mainGUI(''updateAxes'',gcbo,[],guidata(gcbo))')
set (handles. popupmenuY, 'callback','mainGUI(''updateAxes'',gcbo,[],guidata(gcbo))')
function  setPopupmenuString(hObject, eventdata, handles)
fileName=handles.fileName;
[numbers,colNames]=xlsread(fileName);
set(hObject,'string',colNames);

function [x,y] = readExcelColumns (fileName, xColNum, yColNum)
a= xlsread(fileName);
x=a(:,xColNum);
y=a(:,yColNum)

function updateAxes (hObject, eventdata, handles)
xColNum = get(handles.popupmenuX, 'value');
yColNum = get(handles.popupmenuY, 'value');
fileName=handles.fileName;

[x,y] = readExcelColumns (fileName, xColNum, yColNum)

plot (handles.axes1,x,y)

function popupmenuY_Callback(hObject, eventdata, handles)

function popupmenuY_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

function popupmenuX_Callback(hObject, eventdata, handles)

function popupmenuX_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

[Sean de Wolski]

So you want to plot each new set of data as an additional line on the graph?

[Dzhamshed]

Not new set of data, for example there are 8 columns with various temperature values. I want a possibility to choose, which columns are need for the graph, maybe is I choose 4 of them, there must be 4 resultant lines on the coordinate plane, and so on.

Answer 1

[Sean de Wolski]

Use plot() to plot four lines. Consider the following:

x = rand(8,10);
plot(x(:,[1 3 5 8])) %plot the first third fifth and eighth columns of x.

[Dzhamshed]

Can you show me on my code? Just I don't know anything about MatLAB