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Questions - reshape

error with cast(reshape), can't find column variable, long to wide

I have used the cast function before with no issues. I am having trouble with this recent dataset. I get this: Error: Can't subset columns that don't exist. x Column `lambs` doesn't exist." It i...
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CB55

r

casting

reshape

Votes: 0

Answers: 1

Latest Answer

Here, cast assumes that you want lambs as the value column, so it is no longer available as a variable to recast by. Presumably you wanted the value to come from the "lid" column: reshape::c...
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Allan Cameron

Zernike moment as Shape descriptor doesn't work

I m working to create a CBIR, I want to use Zernike moment to get shape feature of a query image. I try to implement it by following this tutoriel: https://pyimagesearch.com/2014/05/19/building-pokede...
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Allassane Dicko

python

opencv

reshape

cbir

imutils

Votes: 0

Answers: 1

Latest Answer

I finally, i get the answer. i just changed the thresh[thresh > 0] = 255 to thresh[thresh > 15] = 255 and reverse the color just after. the solved code is here: from statistics import mode from...
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Allassane Dicko

transform data.table in r

I have data like this: data1=data.frame("long_customers"=c(TRUE, FALSE, FALSE, TRUE), "long_partners"=c(FALSE, TRUE, FALSE, FALSE), "short_cu...
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Odysseus

r

dataframe

datatable

transform

reshape

Votes: 0

Answers: 2

Latest Answer

You can use pivot_longer and separate: library(tidyverse) data1 %>% pivot_longer(cols = everything()) %>% separate(name, into = c("x", "y")) %>% arrange(x, y) #...
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Maël

Swapping the columns and rows of a 3D numpy array by numpy.reshape()

Now I have a 3D numpy array with shape (2,3,4) as follows: [[[ 0 1 2 3] [ 4 5 6 7] [ 8 9 10 11]] [[12 13 14 15] [16 17 18 19] [20 21 22 23]]] Now, I want to reshape the array to (2,4...
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ray

python

arrays

numpy

reshape

Votes: 0

Answers: 1

Latest Answer

It can be done with a transpose on the last two axes: arr = np.array([[[ 0 , 1, 2, 3], [ 4 , 5, 6, 7], [ 8 , 9, 10, 11]], [[12, 13, 14, 15], ...
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Z Li

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