Importing and Visualizing Data, Images, and Audio
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Introduction
You can import data from many different types of files, including
text files and spreadsheets
images
audio
and more
Additionally, if your Maple worksheet is saved as a Workbook, you can attach your data file to the Workbook; this means you only have to manage one file on your computer, not several.
Import and Plot Data from Excel
data≔ExcelTools:−Importcatkerneloptsdatadir,/Excel/ExperimentalData.xls,Experimental,A2:B12:
plotdata
Import, Play, and Visualize Audio
Here, we import and play audio, and then generate a spectrogram and periodogram of its frequency contents.
The audio is imported as an array of data.
audioFile≔AudioTools:- Readcatkerneloptsdatadir,/audio/maplesim.wav
audioFile≔?
This data can be manipulated and further explored using tools from the AudioTools and SignalProcessing packages.
AudioTools:-PlayaudioFile
Spectrogram and Power Spectrum of an Audio File
withSignalProcessing:
SpectrogramaudioFile,size=800,200
PeriodogramaudioFile,size=800,200
Import and Display an Image
img≔ImageTools:-Readcatkerneloptsmapledir,/data/images/worldmap.jpg
ImageTools:-Embedimg
Import Data Assistant
Rather than writing commands to import data, you can also use the Import Data assistant from the Tools > Assistants menu.
Applications
Identifying Periodicity of Sunspots
El Centro Earthquake Analysis
System Identification
Spectrograms
PV Diode Parameter Estimation
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