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Editorial Team
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Asked: 2026-06-14T09:10:23+00:00

Say, I have a feature vector vec , which is actually a picture (stretched).

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Say, I have a feature vector vec, which is actually a picture (stretched). To show it, I am using the solution from this post: image(matrix(vec,nrow=height,ncol=width),axes = FALSE,col = grey(seq(0, 1, length = 256))), but because the origin is at the bottom left corner so the picture is rotated 90°. I think I can move the origin too but R should have a function like imshow in MATLAB which is more appropriate and direct for showing a picture without the need of configuring so much, while image() is for visualizing a matrix. So, is there such a function? Thank you.

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1 Answer

  1. Editorial Team

    Transposing your matrix by t() is the solution:

    vec = runif(4096)
vec[1:500]=0
v = matrix(vec,nrow=height,ncol=width)
image(v,axes = FALSE,col = grey(seq(0, 1, length = 256)))

    enter image description here

    image(t(v),axes = FALSE,col = grey(seq(0, 1, length = 256)))

    enter image description here

    Or to flip it:

    image(t(v)[, nrow(v):1],axes = FALSE,col = grey(seq(0, 1, length = 256)))

    enter image description here

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