An introduction to matlab
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This document provides an introduction to MATLAB by covering key topics like the command window, inputs and outputs, M files, and basic programming structures in MATLAB such as conditionals and loops. Some key points covered include how to enter and manipulate matrices in the command window, perform basic math operations, load and save data, plot graphs, write M files to organize commands and create functions, and use conditional statements and loops in M files.
![The Command WindowMatrix basedEntering a matrixa = [ 1 2 3; 4 5 6; 7 8 9]](https://image.slidesharecdn.com/anintroductiontomatlab-110119024254-phpapp01/85/An-introduction-to-matlab-4-320.jpg)
![The Command WindowCombining matricesConstruct a matrix with matrices inside it!b = [a, a; a, a]Deleting rows and columnsa(:, 2) = []a(1,:) = []](https://image.slidesharecdn.com/anintroductiontomatlab-110119024254-phpapp01/85/An-introduction-to-matlab-11-320.jpg)
![Inputs and OutputsAdding informationxlable and ylableBoth take a text argument ‘<text>’title(‘<name>’, [‘<property name>’], [value])PropertiesFontColour legend(‘<text>’, ‘<text>’ …)Text for each data set](https://image.slidesharecdn.com/anintroductiontomatlab-110119024254-phpapp01/85/An-introduction-to-matlab-22-320.jpg)
![Inputs and OutputsLine stylesPlot(x, y, [‘<colour / style’])c, m, y, r, g, b, w, k‘-’, ‘- -’, ‘:’, ‘- .’Marker types‘+’ ‘o’ ‘*’ ‘x’ ‘<‘ ‘>’ ‘^’ ‘v’‘s’ ‘d’ ‘p’ ‘h’plot(x,y,’k-s’)](https://image.slidesharecdn.com/anintroductiontomatlab-110119024254-phpapp01/85/An-introduction-to-matlab-23-320.jpg)
![Inputs and Outputsholdon or offAllows plotting to the current graph [x,y,z]= peaks contour(x,y,z,20,’k’) hold onpcolour(x,y,z) shading interp hold off](https://image.slidesharecdn.com/anintroductiontomatlab-110119024254-phpapp01/85/An-introduction-to-matlab-25-320.jpg)
![Inputs and Outputs[x,y]=meshgrid(-8:.5:8);r=sqrt(x.^2+y.^2)+eps;z = sin(r)./r;mesh(x,y,z,'EdgeColor','black');](https://image.slidesharecdn.com/anintroductiontomatlab-110119024254-phpapp01/85/An-introduction-to-matlab-27-320.jpg)
![M FilesCommandsFunctionsLike a program fileFunction headersfunction [<outputs>] = FunctionName(<inputs>Function name = name of the fileFunctionName.m](https://image.slidesharecdn.com/anintroductiontomatlab-110119024254-phpapp01/85/An-introduction-to-matlab-31-320.jpg)
![M Filesfunction Wrist(VOnset, Dist)function [Max, Idx] = FindAllMax(Data, Offset)](https://image.slidesharecdn.com/anintroductiontomatlab-110119024254-phpapp01/85/An-introduction-to-matlab-32-320.jpg)
An introduction to matlab
- 1. An Introduction to MatlabDr Andrew Wallace PhD BEng(hons) EurIngC-124a
- 2. OverviewThe command windowInputs and outputsM files
- 3. Current DirectoryCommand WindowCommand History
- 4. The Command WindowMatrix basedEntering a matrixa = [ 1 2 3; 4 5 6; 7 8 9]
- 5. The Command WindowBuilt in FunctionsSumTranspose (‘)Diag
- 6. The Command WindowLocating an element in a matrixa(i, j) (row i, column j):
- 8. The Command WindowBasic maths commands+ addition- subtraction* multiplication/ division^ Power() Precedence
- 9. The Command WindowAdding matricesa+ba(i,j) + b(i,j)MultiplicationA rows = b columns
- 10. The Command WindowElement by element operators.*./.^
- 11. The Command WindowCombining matricesConstruct a matrix with matrices inside it!b = [a, a; a, a]Deleting rows and columnsa(:, 2) = []a(1,:) = []
- 12. The Command WindowFormatControl the display formatshort or longrat or hexe or eng
- 13. The Command WindowEditing the command lineUse the Use command history
- 14. The Command Window:Creates arrays<start> : <end>Add spacing<start> : <spacing> : <end>
- 15. Inputs and Outputsfid = fopen(<file name>, ‘<read write access>')fprintf(fid, ‘<string>', <variables>)%s\t%d\n
- 17. Inputs and OutputsLoadLoads in data in either binary of ascii format
- 18. Inputs and OutputsLoading imagesimread(‘<filename’)
- 20. Inputs and OutputsM filesCommandsAs you would type them into the command windowFile ends with “.m”Functions
- 21. Inputs and Outputsplot(x,y)Display graphsx=0:pi/100:2*pisin(x)
- 22. Inputs and OutputsAdding informationxlable and ylableBoth take a text argument ‘<text>’title(‘<name>’, [‘<property name>’], [value])PropertiesFontColour legend(‘<text>’, ‘<text>’ …)Text for each data set
- 23. Inputs and OutputsLine stylesPlot(x, y, [‘<colour / style’])c, m, y, r, g, b, w, k‘-’, ‘- -’, ‘:’, ‘- .’Marker types‘+’ ‘o’ ‘*’ ‘x’ ‘<‘ ‘>’ ‘^’ ‘v’‘s’ ‘d’ ‘p’ ‘h’plot(x,y,’k-s’)
- 25. Inputs and Outputsholdon or offAllows plotting to the current graph [x,y,z]= peaks contour(x,y,z,20,’k’) hold onpcolour(x,y,z) shading interp hold off
- 27. Inputs and Outputs[x,y]=meshgrid(-8:.5:8);r=sqrt(x.^2+y.^2)+eps;z = sin(r)./r;mesh(x,y,z,'EdgeColor','black');
- 31. M FilesCommandsFunctionsLike a program fileFunction headersfunction [<outputs>] = FunctionName(<inputs>Function name = name of the fileFunctionName.m
- 32. M Filesfunction Wrist(VOnset, Dist)function [Max, Idx] = FindAllMax(Data, Offset)
- 34. M FilesConditionalsIf <condition> …else if <condition> …else …end
- 35. M Filesif NumOfMarkers < 10XYZData = PadOutData(XYZData, NumOfMarkers)Endif VelOnSet > YOnSetOnsetBk = VelOnSetelseOnsetBk = YOnSetend
- 36. M Filesswitch (<condition>) case … … case … … otherwise …end
- 37. M Filesswitch (rem(n,4)==0) + (rem(n,2)==0) case 0 M = odd_magic(n) case 1 M = single_even_magic(n) case 2 M = double_even_magic(n) otherwise error('This is impossible') end
- 39. M Filesfor <index> = <start>:<end> …endfor i = 1:length(XCoorHWL) if XCoorHWLMax < XCoorHWL(i)XCoorHWLMax = XCoorHWL(i) XCoorHWLMaxIdx = i endend
- 40. M FilesWhile <condition>…endwhile (a < g_OnsetVel)VelOnSet = VelOnSet + 1 a = vel(VelOnSet)end
- 41. M FilesconditionFor loopNext iterationbreakExit earlytry …catch exceptObj …end
- 42. Questions?