xyp1.m

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%                             xyp1.m
%  Scope:   This MATLAB program plots a x-y graph for a selected column from 
%           an ASCII data file; manual scaling is available. 
%  Usage:   xyp1
%  Inputs:  - the name of the ASCII input data file (with extension),
%           - the selected x-axis column index,
%           - the column number to be plotted,
%           - title of the plot,
%           - y-axis label,
%           - x-axis label,
%           - optional, new axes limits [xmin xmax ymin ymax].
%  Outputs: - selected graph
%  Remarks: The user can select the x-axis column; the other columns are used
%           for y-axis coordinates. Each  y  column data (when selected) is 
%           independently plotted against  x  column data.
%           If statistics is needed use xyp1s.
%  Last update: 08/23/00
%  Copyright (C) 1997-00 by LL Consulting. All Rights Reserved.

clear
close all

disp('  ');
fname = input('Specify the name of the input file (with extension) --> ','s');
hh = load(fname);
[npt,nmax] = size(hh);
if  nmax <= 1
   disp('  ');
   disp('Error  -  XYP1; ASCII input file has less than 2 columns');
   disp('  ');
   return; 
end

disp('  ');
nx = input('Enter the column used for x-axis -->  ');
if ((nx <= nmax) & (nx >= 1)),
   x = hh(1:npt,nx);
else
   disp('  ');
   disp('x-axis column is not in the range; check the selection ...');
   disp('  ');
   return; 
end 

yes = 'y';
answer = 'y';
disp('  ');
fignr = 0;
while (strcmp(answer,yes) == 1)
   fignr = fignr + 1;
   n = input('Enter the column number to be plotted -->  ');
   disp('  ');
   if ( (n <= nmax) & (n ~= nx) & (n >= 1) ),
      y = hh(1:npt,n);
      aa = input('Enter title of the plot:  ','s');
      bb = input('Enter  Y  label:  ','s');
      cc = input('Enter  X  label:  ','s');
      xmin = min(x);
      xmax = max(x);
      ymin = min(y);
      ymax = max(y);
      disp('   ');
      figure(fignr)
      plot(x,y),grid,...
      title(aa), ylabel(bb),xlabel(cc)
      temp = input('Press <Enter> or <Return> key to continue ..... ');
      disp('  ');

%  Select manual scaling for both axes

      manscaleq = input('Do you want manual scaling? (y/n)[n] ','s');
      if (strcmp(manscaleq,yes) == 1),
         redo_axes_limits = 1;
         while (redo_axes_limits == 1)
            fprintf('\nCurrent limits are : \n');
            fprintf('   xmin = %14.7f \n',xmin);
            fprintf('   xmax = %14.7f \n',xmax);
            fprintf('   ymin = %14.7f \n',ymin);
            fprintf('   ymax = %14.7f \n',ymax);
            disp('   ');
            axes_limits = input('Enter axes limits [xmin xmax ymin ymax] :  ');
            xmin = axes_limits(1);
            xmax = axes_limits(2);
            ymin = axes_limits(3);
            ymax = axes_limits(4);
            fprintf('\nSelected limits are : \n');
            fprintf('   xmin = %14.7f \n',xmin);
            fprintf('   xmax = %14.7f \n',xmax);
            fprintf('   ymin = %14.7f \n',ymin);
            fprintf('   ymax = %14.7f \n',ymax);
            disp('   ');
            newlimq = input('Do you want to change axes limits? (y/n)[n] ','s');
            if (strcmp(newlimq,yes) == 0),
               redo_axes_limits = 0;
            end
         end
         clear xnew;
         clear ynew;
         kk = 0;
         for k = 1:npt
            if ((x(k) >= xmin) & (x(k) <= xmax)),
               kk = kk + 1;
               xnew(kk) = x(k);
               ynew(kk) = y(k);
            end
         end 
         fignr = fignr + 1;
         figure(fignr)
         plot(xnew,ynew), grid,...
         axis([xmin xmax ymin ymax]),...
         title(aa), ylabel(bb), xlabel(cc),...
         disp('  ');
         temp = input('Press <Enter> or <Return> key to continue ..... ');
      end
   else
      disp('y-axis column is not in the range; check the selection ...');
      temp = ['The column range is: 1 to  ',num2str(nmax)];
      disp(temp);
   end
   disp('  ');
   answer = input('Do you want another plot? (y/n)[n] ','s');
   disp('  ');
end

disp('End of the program  XYP1 ');
disp('  ');