Username: ims0xxx
Password (initially is): 00-xxxxxxxxwhere xxxxxxxx is your 8 digit student ID number.
To log off:
Place mouse somewhere in background, click left mouse button and select "Exit Window Manager"
Change Your Password:
When you log in change your password to some combination of 8 letters, numbers and/or punctuation marks. Type:
kpasswd
in your C-chell window. The command will prompt you to enter your old password, and new password twice.
Web access Type
netscape &
Enter:
http://www.math.montana.edu/~pernarow
and then "Return". Click "Courses" then "M441".
MATLAB Type "matlab" and wait. The screeen should look like:
The ">>" is the matlab prompt where commands can be entered. To exit matlab:
>>quit
Arithmetic Calculations Try the following commands:
x=10
y=20
x*y
x/y
x+y
x^y
sin(x)
atan(x)
log(x)
z=2*x-y*x
z
Vectors Row vectors can be entered in two ways. Try the following:
x=[5 6 7 8]
x=[5,6,7,8]
If you want to make it a column vector use the ' symbol to take the transpose
y=x'
or enter it directly as
y=[5;6;7;8]
The the i-th component of a vector
y(2)
y(2)*y(4)
z=y(1)+y(2)+y(3)
Entering large vectors with equal increments:
x=0:1:10
creates a vector with 11 components ranging from 0 to 10 in increments of 1. Try
y=-1.1:0.1:-0.3
Doing this may create huge vectors. If you don't want matlab to show the value you assigned put a semicolon at the end
y=0:0.01:1;
Vector calculations The symbols + - * / ^ are reserved for scalar calulations. Putting a dot in front changes them to component by component calculations on vectors (and matrices). For instance
You can also use elementary math functions as in
x=0:0.2:2
y=sin(2*x)
Basic plots
To make a plot of sin(x)^2 on [0,10] try
x=0:0.1:10;
y=sin(x).^2;
plot(x,y);
plot(x,sin(x).^2);
Sums and series
If you want to sum the components of a vector use the sum command
x=1:1:10;
sum(x)
would return the sum of 1+2+3+4+...+10. So suppose you wanted to sum the series
1+1/2^2+1/3^2+1/4^2+...1/7^2
you could type
n=7;
x=1:n;
y=1./x.^2;
sum(y)
Change n and try again