R sum rows of matrix

    • [DOC File]R Tutorial:

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      Geometric Interpretation of Gene Co-Expression Network Analysis, Applied to Brain Cancer Microarray Data. Jun Dong, Steve Horvath. Correspondence: shorvath@mednet ...


    • [DOC File]Working With Matrices in R

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      To create a matrix in R, we may use the matrix function. We need to provide a vector containing the elements of the matrix, and specify either the number of rows or the number of columns of the matrix. This number should divide evenly into the length of the vector, or we will get a warning. For example, to make a 2 x 3 matrix named M consisting ...


    • [DOCX File]Rotation Matrices

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      Call R. v (θ) the 2x2 matrix corresponding to rotation of all vectors by angle +θ. Since a rotation doesn’t change the size of a unit square or flip its orientation, det(R v ) must = 1. Consider what happens to the unit vectors 1 0 and 0 1 when rotated CCW by angle θ: 1 0 gets sent to cos θ sin θ , and 0 1 gets sent to …


    • [DOC File]Matrix Algegra Review - Texas A&M University

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      (b) Multiply matrix A by the appropriate identity matrix, I, that is, find AI. Calculate IA, using the appropriate identity matrix. (c) What unique property does the identity matrix have? Identity matrix plays the role of what scalar number in algebra? 6. The . null . matrix is a matrix of zeros for all elements; it can be of any dimension.


    • [DOC File]Matrix Operations - MUSC

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      matrix + matrix. Notice the sum is also the same shape as the the first two matrices. ... The rank of a matrix is the number of rows of that matrix which are linearly independent. If a matrix row is linearly independent, then it is not a multiple of another row, nor is it a linear combination of any of the other rows in the matrix…


    • [DOC File]Lumping the Markov Chain for Co-occurrence Matrices Using ...

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      Performing a column swap on a co-occurrence matrix means interchanging two columns that have the same sum. Observation 4: Row and column swaps conserve the row and column sums and the number of checkerboard units of the matrix. Definition 5: Let A = A(r, c) be the set of all nxm co-occurrence matrices with row sums . r


    • [DOC File]Assignment 1: Introduction to R - University of Idaho

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      Assignment 1: Introduction to R. This assignment is an opportunity to try the R statistical package and to start to learn some of its behaviors and options. Text like this will be general comments. Text like this will be my commands to R, the R prompt is a "greater than" sign (>). Text like this will be output from R …


    • [DOC File]Chapter 1 Basic Mathematical Concepts

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      Note that just as postmultiplication by a diagonal matrix operates on the columns of the premultiplying matrix, premultiplying by a diagonal matrix operates on the rows of the postmultiplying matrix. Now we are ready to create the matrix of correlations, R. The correlation matrix is the covariance matrix of the z …


    • [DOC File]Making a Scatterplot in R Commander

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      Note here that R thinks of the ANOVA table as a matrix consisting of four rows and five columns. Of course, the number of rows depends on the number of predictors in the model. The first command adds all the values in the second column ("Sum Sq") of the table.


    • [DOC File]Assignment 1: Introduction to R - University of Idaho

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      Matrices can be created with the matrix command, specifying all elements (column-by-column) as well as the number of rows and number of columns. > A A


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