How to remove hundreds of columns from a matrix? I am trying to remove the columns from my matrix. However whenever I run this code an error pops up and my matrix is not reduced... meer dan 5 jaar ago | 2 answers | 0 2
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I will tag a special blank column to differentiate which representation we are in. Otherwise I forward all arguments to the ordinary DataFrames constructor so you can build these as you would any DataFrame. Each row of the dataframe is either one vector from the...
Let’s remove an entry now. ## Removing an entry permanently from a dictionary pop!(dictionary, 'J') dictionary Output: Dict{Char, Int64} with 2 entries: 'A' => 1 'B' => 2 Working with matrices A matrix is an array of numbers represented as a vector of vectors. Here’s how you...
resample_matrix(m::Matrix{Float64}, n::Int)=m[1:n:end,:]#resample every nth row Now we can take an input vector (which I’ll call V) and create an array V_resampled where I sample every tenth point: V_resampled=map(m->resample_matrix(m,10), V) ...
postID = row_number()) Now it’s time to tokenize and tidy the text, remove some stop words (and numbers, although this is an analytical choice that you might want to try in a different way), and then cast to a sparse matrix. I’m using thetoken = "tweets"option for tokenizing ...
and so has a 1 in that row/column. (And also Sufjan shows up in my term-document matrix! So seasonally appropriate.Best Christmas album ever? Orabsolutely Christmas album ever?) We can see we might want to use stemming; do we really want to keepsufferandsufferingseparate in this matrix?
There are symplectic solvers for second order ODEs, the stiff solvers allow for solving DAEs in mass matrix form, there’s a constant-lag nonstiff delay differential equation solver (RETARD), there is a fantastic generalization of radau to stiff state-dependent delay differential equations (RADAR...
(3),falses(3)#tupleofvectoroftruesandoffalses eye(3)#3x3Float64identitymatrix linspace(1,2,5)#5elementequallyspacedvector 1:10#iterablefrom1to10 1:2:10#iterablefrom1to9with2skip reshape(1:12,3,4)#3x4arrayfilledwith1:12values fill("a",2,2)#2x2arrayfilledwith"a" repmat(eye(2),...