%
%  my first matlab script
%     (note the "percent" signs indicate non-executed comment lines)
%
%  save as: "hw00a.m"
%  to run:  type "hw00a" at the matlab prompt (note:  you may have to set 
%     the directory/folder into the matlab path), or use the "run" menu
%     choice (not sure of exact PC name of run script menu choice).
%
%  browser help:  type "helpdesk" at the matlab prompt
%
%  instant help:  type "help xxxx" for help about command xxxx
%     (try "help clf", etc)
%
%- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

%  make a vector series from 0 to pi

x = 0:pi/50:pi;

y = tan(x/4);

%  plot the function y(x)

clf
plot(x,y)
hold on 
plot(x,y,'r.')

%  label my plot (!!! very important !!!)

title('my first plot of y(x)')
xlabel('x-axis')
ylabel('y-axis')
axis([0 pi 0 1])
text(0.2,0.90,'this is a plot of the function y(x) = tan(x/4) ...')
text(1.5,0.80,'... from x = 0 to \pi !')

disp(' ')
disp('  done')
disp(' ')