Not enough input arguments error

Hi all; I am plotting data from excel file by using MATLAB these data are:

x-Axis = time (from excel)

y-Axis = power (from excel)

but I am getting this error while plotting:

Not enough input arguments.

my code is :

     [num,T,vT] = xlsread('Excel.xlsx','Sheet1');      % read excel
     x= datestr(num(:,1),('HH:MM'));                   % time column
     y = num(:,4);                                     % power column 

     plot(handles.axes8,x,y);

why I am getting this error ? and how to solve it ?? please please help and advice... thank you very much

[Richard]

what happens when you type plot(x,y) ?

[Image Analyst]

Don't paraphrase it. Copy and paste all, yes ALL, the red text.

[Samer Husam]

this is the all red message:

??? Error using ==> plot Not enough input arguments.

Error in ==> simpletab>pushbutton1_Callback at 1600 plot(handles.axes8,x1,y);

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

Error in ==> simpletab at 18 gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback

Answer 1

[Samer Husam]

the problem been solved by using (datetick), as following code:

     [num,T,vT] = xlsread('Excel.xlsx','Sheet1');      % read excel
     x = num(:,1);                                     % Time column
     y = num(:,4);                                     % power column 

     plot(handles.axes,x,y);
     datetick(handles.axes8,'x',15)

Answer 2

[Samer Husam]

when I am using this code :

[num,T,vT] = xlsread('Excel.xlsx','Sheet1');      % read excel
   x = num(:,1);                                  % Time column
   y = num(:,4);                                  % power column
   x1= datenum(x,'HH:MM');
   plot(handles.axes8,x1,y);

I am getting this error:

??? DATENUM failed.

Error using ==> datenum at 103

The input to DATENUM was not an array of strings.

why this error is happen ??

[Walter Roberson]

The first output returned by xlsread is always a numeric array. You are then taking a portion of that numeric array and attempting to convert it to a date number as if it is a string. But it isn't a string.

Perhaps you should be passing T(:,1) in to datenum()

[Samer Husam]

I have tired this way before as well, but the error comes is :

??? DATENUM failed.

Error using ==> dtstr2dtnummx

Failed on converting date string to date number.

[Walter Roberson]

Your code in your original Question shows you passing part of "num" to datenum(), rather than passing part of "T" to datenum(). Have you tried with "T" ? Could you show an example string that you are passing to datenum() ?