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Trims rows and columns from the edges of a surface matrix that contain missing values only.
x3p_trim_na(x3p, ratio = 1)
x3p object of the same or smaller dimension where missing values are removed from the boundaries
x3p object
ratio between zero and one, indicating the percent of values that need to be missing in each row and column, for the row or column to be removed
logo <- x3p_read(system.file("csafe-logo.x3p", package="x3ptools")) logo$surface.matrix[logo$surface.matrix == median(logo$surface.matrix)] <- NA x3p_trim_na(logo) # reduced to dimension: 668 by 268
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