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[工学]线性代数的Matlab口令
The Very Basics Variables, Vectors, and Matrices Loops and Functions Plotting and Graphics
EE 20: Linear Methods for Engineering
Analysis and Design Using MATLAB
Lecture 1
Introduction to MATLAB
The Very Basics Variables, Vectors, and Matrices Loops and Functions Plotting and Graphics
Command Prompt
Enter commands at the prompt
Example:
2 + 3
ans =
5
Another example:
pi
ans =
3.1416
The Very Basics Variables, Vectors, and Matrices Loops and Functions Plotting and Graphics
M Files
You can prepare files consisting of MATLAB commands to be
executed in order. They need to have a “ .m” extension.
For example, let the contents of file test.m be
disp(’Hello world!’)
2 + 5*cos(pi/6)ˆ2 - 3*sin(pi/8)
disp(’Goodbye world...’)
At the command prompt:
test
Hello world!
ans =
4.6019
Goodbye world...
The Very Basics Variables, Vectors, and Matrices Loops and Functions Plotting and Graphics
Short and Long Formats
The format command changes the display mode.
format long
pi
ans =
3.141592653589793
format short
pi
ans =
3.1416
The default format is short
The Very Basics Variables, Vectors, and Matrices Loops and Functions Plotting and Graphics
How To Get Help
The help command followed by another command name:
help format
FORMAT Set output format.
FORMAT with no inputs sets the output format to the default appropriate
for the class of
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