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Presenting your dataHugo Leblanc - November 4

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Presenting your data• Data management

• Importing/Exporting data

• File operations

• Spreadsheets

• Images

• Graphics

• Plots

• Formating

• Exporting

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Data management

• Importing/Exporting data

• File operations

• Spreadsheets

• Images

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Importing/Exporting data

• Workspace variables can be imported and

exported between sessions

• MAT files are used to store the variables inside

an external file

• save and load are used to handle importing and

exporting workspace variables

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File Operations

• You can access text files with MATLAB

• importdata can directly read a text file and

generate an array with the revenant information

(or uiimport to have a GUI helper)

• To deal directly with files, you need to open the

file with open to get a file identifier (FileID). A file

identifier is a token that represents the file to

other functions

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Spreadsheets (Excel)

• MATLAB includes functions to directly import/ export data to .xlsx files

• xlsread and xlswrite are used to deal directly

with Excel files

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Images

• Images can be converted into a matrix of data

inside of matlab

• imformats displays which image format MATLAB

can handle and their respective function names

• imread and imwrite are use to import/export

image data inside of MATLAB

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Graphics

• Plots

• Formating

• Exporting

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Plots

• Basics

• Line plots

• Pie charts, Bar plots and histograms

•  Surfaces

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Plots basics

• MATLAB uses figures to display graphics

• Multiple figures can be used at once, with only

one being the 'selected' one

•

The functions figure can open blank displays

• close is used to close figures

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Line plots

• plot - 2-D Line plot

• plotyy - 2-D Line plot with different y axis

• plot3 - 3-D Line plot

• loglog - Log-log scale plot

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Pie charts, Bar plots and

histograms• bar - bar graph

• bar3 - 3-D bar graph

• pie/pie3 - pie chart

• hist - Histogram plot

• histc - Histogram bin count plot

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Surfaces

• surf - Surface 3-D plot

• surfc - Surface 3-D plot with contours

• mesh - mesh plot

• meshc - mesh plot with contours

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Formating

• Title and labels

• Coordinate system

• Annotations

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Title and labels

• title, xlabel, ylabel, zlabel - Label the different

axes

• legend - add legend for lines

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Coordinate system

• xlim, ylim, zlim - Limits the bords of a figure

•

box - Displays the boundary of limits

• grid - Displays inside grid in figures

• subplot - Create multiple plots inside the same

figure

• hold - Retain graph when adding new graphs

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Annotations

• annotation - Create a text box inside the figure

• text - Annotate points in the graph

• ginput - Input a selection from a graph

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Exporting

•

print - prints the current figure

• savefig - Save the figure under the MATLAB .ifg

format

• saveas - Save the figure as an image