Tutorial 1: Matlab basics Erjia Yan

 Getting started  Install and use Matlab  Data format in Matlab  Export and import data in Matlab  Useful functions and commands  Programming in Matlab  Resources

 Getting started  Install and use Matlab  Data format in Matlab  Export and import data in Matlab  Useful functions and commands  Programming in Matlab  Resources Some screenshots are taken from

 High-level language for numerical computation, visualization, and application development  Built-in mathematical functions for linear algebra, statistics, matrix manipulation, etc.  Extensive tool-boxes (e.g., accounting, bioinformatics, etc.)  Built-in graphics for visualizing data and tools for creating custom plots  Functions for integrating MATLAB based algorithms with external applications and languages such as C, Java,.NET, and Microsoft ® Excel ®

 Getting started  Install and use Matlab  Data format in Matlab  Export and import data in Matlab  Useful functions and commands  Programming in Matlab  Resources

 Desktop installation Per year Only available on university-owned computers Students can purchase directly from Mathworks.com

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 East and west tower desktops  And most UITS desktops on campus, except for stand-alone informstations

  For large data processing; batch file-based  Need to register an account before using  Windows users can use WinSCP and Putty to upload/download files and send commands

Interface

Image interface large/matlab_audio_funky_plot_spectrogram_detail.jpg

 Getting started  Install and use Matlab  Data format in Matlab  Export and import data in Matlab  Useful functions and commands  Programming in Matlab  Resources

 Number: 4.34  Character: ‘variable_name’  Do not need to state variable types  a=4.34  cellname=‘networks’  Built-in variable (do not use them)  pi, Inf, -Inf, ans, NaN

 row=[1,2,3,4,5]  a 1*5 matrix  column=[1;2;3;4;5]  a 5*1 matrix  a=[1,2;3,4]  a 2*2 matrix You can give any variable names to row and column.

 Getting started  Install and use Matlab  Data format in Matlab  Export and import data in Matlab  Useful functions and commands  Programming in Matlab  Resources

 a=xlsread(filename)  a=xlsread(filename,sheet)  a=xlsread(filename,xlRange)  a=xlsread(filename,sheet,xlRange) For other import and export functions in Matlab, such as textual data, XML, etc., you can find relevant information here: import-and-export.html

 xlswrite(filename,A)  xlswrite(filename,A,sheet)  xlswrite(filename,A,xlRange)  xlswrite(filename,A,sheet,xlRange)

 a = csvread(filename,row,col)  csvwrite(filename,a,row,col) row and col are zero based, meaning that they start from 0 but not 1

 S = spconvert(D)  Sparse matrix format  row_id col_id value  First use load to upload the data into Matlab and then use spconvert to convert the data into a matrix  load datasample.txt  M = spconvert(datasample)

 You can use mmwrite(filename,M)  b/mmiomatlab.html b/mmiomatlab.html

 Getting started  Install and use Matlab  Data format in Matlab  Export and import data in Matlab  Useful functions and commands  Programming in Matlab  Resources

 Arithmetic operations (+,-,*,/)  4+5*7-2  Exponentiation (^)  2^3=8

 sqrt(2)  log(2), log10(0.23)  cos(1.2), atan(-.8)  exp(2+4*i)  round(1.4)=1, floor(3.9)=3, ceil(4.23)=5  plot(x,y)  And countless more…

 Transpose  transpose(M)  M’  Addition and subtraction  M-M’=  M+M’=

 For element-wise operations, use the dot:.(.*,./,.^)  M.*M’=  M./M’=  Matrix operations  M*M’=

 M(1,1)=1; M(1,2)=2  M(1,:)=[1 2]  M(1:2,2)=

 Getting started  Install and use Matlab  Data format in Matlab  Export and import data in Matlab  Useful functions and commands  Programming in Matlab  Resources

 Compiler   Object-Oriented Programming  oriented-programming.html oriented-programming.html

 Getting started  Install and use Matlab  Data format in Matlab  Export and import data in Matlab  Useful functions and commands  Programming in Matlab  Resources

 help command in Matlab…the most useful  Matlab Central   MIT Open Course  and-computer-science/6-094-introduction-to- matlab-january-iap-2010/lecture-notes/ and-computer-science/6-094-introduction-to- matlab-january-iap-2010/lecture-notes/  Google “matlab + keywords”