vectorization
Is it possible to vectorise the sequential update of the elements of a vector in R?
Is it possible to vectorise code like the following? length(x) <- 100; x[1]<- 1; y<- rnorm(100);[详细]
2023-02-05 05:40 分类：问答how to write api like a vectormagic
I want to write api like ahttp://vectormagic.com and I want to know what kind of technologies you will advise me(I know php,html,js,..,c++) to use?[详细]
2023-02-04 15:47 分类：问答Loop vectorization and how to avoid it
Loop vectorization is when all right-hand-side expres开发者_如何学Csions are computed at the onset. I just discovered my loops are being vectorized (in FORTRAN 77... don\'t ask). I need my loop condit[详细]
2023-01-30 12:52 分类：问答Is it possible to vectorize recursive calculation of a NumPy array where each element depends on the previous one?
T(i) = Tm(i) + (T(i-1)-Tm(i))**(-tau(i)) Tm and tau are NumPy vectors of the same length that have开发者_如何学C been previously calculated, and the desire is to create a new vector T. The i is incl[详细]
2023-01-30 02:33 分类：问答How to Calculate single-vector Dot Product using SSE intrinsic functions in C
I am trying to 开发者_StackOverflowmultiply two vectors together where each element of one vector is multiplied by the element in the same index at the other vector.I then want to sum all the elements[详细]
2023-01-24 10:34 分类：问答Why does sapply return a matrix that I need to transpose, and then the transposed matrix will not attach to a dataframe?
I would appreciate insight into why this happens and how I might do this more eloquently. When I use sapply, I would like it to return a 3x2 matrix, but it returns a 2x3 matrix. Why is this? And why[详细]
2023-01-24 02:28 分类：问答Find values in a matrix and put them into a vector
It must be simple, but surprisingly I couldn\'t find an answer to this problem here or by trial-and-error.[详细]
2023-01-20 17:24 分类：问答Incrementing one value of a MATLAB array multiple times in one line
This is a question about incrementing one value of a MATLAB array multiple times in the same statement, without having to use a for loop.[详细]
2023-01-20 03:40 分类：问答How to vectorize a random walk simulation in MATLAB
I am rewriting a Monte Carlo simulation model in MATLAB with an emphasis on readability. The model involves many particles, represented as (x,y,z), following a random walk over a small set of states w[详细]
2023-01-17 22:01 分类：问答how to substitute a for loop in R with an optimized function (lapply?)
I\'ve a data frame with time events on each row. In one row I\'ve have the events types of sender (typeid=1) and on the other the events of the receiver (typeid=2). I want to calculate the delay betwe[详细]
2023-01-15 20:42 分类：问答
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