Matlab
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This document provides descriptions of various MATLAB functions organized into categories: - Commands for managing MATLAB sessions and plotting - Commands for enhancing plots - Commands for creating special matrices and performing mathematical/complex/statistical functions - Predefined input functions for generating signals
Matlab
- 3. MATLAB INSTRUCTIONS Commands for Managing a Session COMMANDS DESCRIPTION clc Clears Command window. clear Removes variables from memory. exist Checks for existence of file or variable global Declares variables to be global. help Searches for a help topic lookfor Searches help entries for a keyword quit Stops MATLAB. who Lists current variables. whos Lists current variables (long display).
- 4. Basic xy Plotting Commands COMMANDS DESCRIPTION axis Sets axis limits fplot Intelligent plotting of functions grid Displays gridlines. plot Generates xy plot. print Prints plot or saves plot to a file title Puts text at top of plot. xlabel Adds text label to x-axis ylabel Adds text label to y-axis. refresh Redraws current figure window
- 5. Plot Enhancement Commands COMMANDS DESCRIPTION subplot Creates plots in subwindows text Places string in figure hold Freezes current plot. set Specifies properties of objects such as axes polar Creates polar plot. bar Creates bar chart. stairs Creates stairs pot.
- 6. COMMANDS DESCRIPTION eye Creates an identity matrix. ones Creates an array of ones. zeros Creates an array of zeros. cross Computes cross products. dot Computes dot products. det Computes determinant of an array. inv Computes inverse of a matrix. rank Computes rank of a matrix. Special Matrices
- 7. COMMANDS DESCRIPTION exp(x) Exponential; ex log(x) Natural logarithm; ln(x) log10(x) Common (base 10) logarithm; log(x)= log10(x). sqrt(x) Square root; of x. acos(x) Inverse cosine; arcos x = cos –1 (x) asin(x) Inverse sine; arcsin x = sin –1 (x). atan(x) Inverse tangent; arctan x = tan –1 (x). acot(x) Inverse cotangent; arccot x = cot – 1(x). Mathematical Functions
- 8. COMMANDS DESCRIPTION abs(x) Absolute value; |x|. angle(x) Angle of a complex number x. conj(x) Complex conjugate of x. imag(x) Imaginary part of a complex number x real(x) Real part of a complex number x. erf(x) Computes the error function erf (x). mean Calculates the average. median Calculates the median. std Calculates the standard deviation Complex Functions and Statistical Functions
- 9. Predefined Input Functions COMMANDS DESCRIPTION gensig Generates a periodic sine, square, or pulse input. sawtooth Generates a periodic sawtooth input. square Generates a square wave input. stepfun Generates a step function input. ilaplace Returns the inverse Laplace transform. laplace Returns the Laplace transform. class Returns the class of an expression.