MATLAB Notes

• Ander Liu

tags: MATLAB

• MATLAB Notes
  • Language Fundamentals
    • Entering Commands
    • Matrices and Arrays
    • Operators and Elementary Operations
    • Data Types
  • Mathematics
    • Elementary Math
    • Exponents and Logarithms
    • Complex Numbers
  • Graphics
    • 2-D and 3-D Plots
    • Formatting and Annotation
    • Graphics Objects
  • Data Import and Analysis
    • Data Import and Export
  • Others
  • Homepage

善用 help！！！ Ex: help mean

Language Fundamentals

Entering Commands

• clc : clear command window

Matrices and Arrays

• x = j:k : [j, j+1, …, k]
• x = j:i:k : [j, j+i, …, k]
• zeros : zeros array
  • zeros(M,N)

Operators and Elementary Operations

Arithmetic

• .*
• ./

Data Types

Numeric Types

• eps
• inf

Mathematics

Elementary Math

Trigonometry

• sin(X)
• cos(X)

Exponents and Logarithms

• exp(X)

Complex Numbers

• abs(X)
• imag(Z)
• real(Z)

Graphics

2-D and 3-D Plots

Line Plots

• loglog() : log-log scale plot
• plot(X,Y) : linear plot
• plot3(x,y,z) : plot lines and points in 3-D space
• semilogx() : semi-log scale plot
• semilogy() : semi-log scale plot
• '+' : plus sign
• 'o' : circle
• '*' : asterisk(星號)
• '.' : point
• 'x' : cross
• 'square' or 's' : square
• 'diamond' or 'd' : diamond
• '^' : upward-pointing triangle
• 'v' : downward-pointing triangle
• '>' : right-pointing triangle
• '<' : left-pointing triangle
• 'pentagram' or 'p' : five-pointed star (pentagram)
• 'hexagram' or 'h' : six-pointed star (hexagram)
• 'r' : red
• 'g' : green
• 'b' : blue
• 'c' : cyan(青)
• 'm' : magenta(洋紅)
• 'y' : yellow
• 'k' : black
• 'w' : white

Discrete Data Plots

• stem(X,Y) : discrete sequence or "stem" plot

Formatting and Annotation

Titles and Labels

• legend(label1,…,labelN) : (圖例)
• title('text') : graph title
• xlabel('text') : X-axis label
• ylabel('text') : Y-axis label
• zlabel('text') : Z-axis label

Axes Appearance

• axis() : control axis scaling and appearance
  • axis([XMIN XMAX YMIN YMAX])
• figure() : create figure window
  • figure(n)
• hold : hold current graph
  • hold on
• subplot() : create axes in tiled(鋪) positions
  • subplot(m,n,p)
  • subplot(mnp)

Graphics Objects

Graphics Object Programming

• close : close figure
  • close all : closes all the open figure windows

Data Import and Analysis

Data Import and Export

Workspace Variables and MAT-Files

• clear : clear variables and functions from memory

Others

• heaviside(X) : step function
• phase(G) : computes the phase of a complex vector
• rectpuls(T,W) : sampled aperiodic rectangle generator

Homepage

• Homepage