matrix

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Read dataset in R in which comma is used for field separator and decimal point

How could you read this dataset in R, the problem is that the numbers are floats and are like 4,000000059604644E+16[详细]

2023-04-07 13:10 分类：问答
how to transform 4 points to an xna matrix

I want to develop my own AR-Library in C#. My problem is: I have the 4 corner points of my marker and want to show 3D cube开发者_运维百科s on the marker (it\'s a multi-marker lib), but I don\'t know h[详细]

2023-04-07 10:57 分类：问答
Converting CvSeq to CvMat

I have a sequence of CvPoint2D32f points in CvSeq and I want to convert it into a CvM开发者_开发百科at. How can I do that?Have a look at cvSeqToArray.It will dump the sequence to a contiguous array of[详细]

2023-04-07 10:27 分类：问答
Calculate percentage of total columns based on total column in SSRS Matrix

Looking to add a column in my SSRS Matrix which will give me the percentage from the total column in that row.[详细]

2023-04-07 10:17 分类：问答
MPI partition matrix into blocks

I want t开发者_如何学运维o partition matrix into blocks (not stripes) and then distribute this blocks using MPI_Scatter.[详细]

2023-04-07 04:22 分类：问答
Matlab: add vector to matrix

I have a 3XN matrix representing a list of 3D coordinates,something like 3333333334343434343535 1718192016171819201617[详细]

2023-04-06 22:32 分类：问答
R Modifying a region of a matrix/data frame depending on another matrix/data frame

I have a question about modifying a matrix. I have managed to change values in a matrix depending on the value[详细]

2023-04-06 15:45 分类：问答
Matrix multiplication for sparse matrices in Python

I want to multiply a sparse matrix A, with a matrix B which has 0, -1, or 1 as elements. To reduce the complexity of the matrix multiplication, I can ignore items if they are 0, or go ahead and add th[详细]

2023-04-06 12:57 分类：问答
Repeating x and y vectors for use with scatter3()

Currently I have a working 3D mesh() plot. Howev开发者_StackOverflow社区er, the vertical axis lends itself better to an angular representation, so I\'m constructing a coordinate transform to cylindric[详细]

2023-04-06 12:56 分类：问答
Oracle - count() in same line

i\'m new user here, and i think that this is amazing!!! I need a little help: i do this, but don\'t work like i want! (count(countOfCat) is no Good!)[详细]

2023-04-06 11:23 分类：问答