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Monthly Archives: May 2007

Repeat elements of a vector

May 17, 2007
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Two methods. The first produces a vector, the second a one column matrix.x=1:10# Method 1rep(x,each=3)# Method 2matrix(t(matrix(x,length(x),3)))

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Convert image to matrix in R

May 17, 2007
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This is how to use the Pixmap library to read in an image as a matrix.__ library(pixmap)# the next command may only work on Linux__ system("convert foo.tiff foo.ppm")__ img To get info on your new object: __ str(img)Although included in the previous output, the size of the image can be extracted by:[email protected] to extract the red channel...

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Calculate turning angles and step lengths from location data

May 16, 2007
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anglefun

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香港赛马会彩券管理局
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