How do you check if two matrices are equality in R?
Try the following. a <- matrix(1:16, ncol=2) b <- matrix(1:16, ncol=4, dimnames=list(1:4, letters[1:4])) d <- matrix(1:16, ncol=4) a == b # Error in a == b : non-conformable arrays identical(a, b) # FALSE all. equal(a, b) # why? different dims and different dimnames all(d == b) # TRUE but identical(d, b) # FALSE all.
How do you compare two matrices equal?
If the size of both the arrays is equal then, loop through both the arrays and compare each element. If any of the corresponding elements are not equal then, set the flag to false and break the loop. If the flag is equal to true which implies matrices are equal. Else, matrices are not equal.
How do you apply a function to each element of a matrix in R?
Syntax – apply()
- X an array or a matrix.
- MARGIN is a vector giving the subscripts which the function will be applied over. For a matrix 1 indicates rows, 2 indicates columns, c(1,2) indicates rows and columns.
- FUN is the function to be applied on the element(s) of x.
What does apply () do in R?
apply() function apply() takes Data frame or matrix as an input and gives output in vector, list or array. Apply function in R is primarily used to avoid explicit uses of loop constructs. It is the most basic of all collections can be used over a matrice. The simplest example is to sum a matrice over all the columns.
How do you check if two matrices are equality in Matlab?
tf = isequal( A,B ) returns logical 1 ( true ) if A and B are equivalent; otherwise, it returns logical 0 ( false ). See the Input Arguments section for a definition of equivalence for each data type.
How do you know if matrices are identical?
For any two matrices to be equal, a number of rows and columns in both the matrix should be equal and the corresponding elements should also be equal.
How do you check if two matrices are the same in Matlab?
How do you check if two matrices are similar in Matlab?
It should be very obvious. A == B will return a matrix the same size as A (and B) telling you which elements of A are equal to the corresponding element of B. isequal(A, B) will return a single true/false telling you if all the elements of A are the same as the ones in B.
How do I apply the same function to all rows and columns of a matrix in R?
In R, you can use the apply() function to apply a function over every row or column of a matrix or data frame.
Is equal function in R?
equal(x, y) is a utility to compare R objects x and y testing ‘near equality’. If they are different, comparison is still made to some extent, and a report of the differences is returned. Do not use all. equal directly in if expressions—either use isTRUE(all.
Why do we need a matrix function in R?
Also, a matrix is a collection of numbers arranged into a fixed number of rows and columns. Usually, the numbers are the real numbers. We reproduce a memory representation of the matrix in R with the matrix function. Hence, the data elements must be of the same basic type.
How do you merge two matrices in R?
Row bind, rbind () function in R, is used to merge two data frames or matrices (m may or may not be equal to n), together by their rows. The matrices involved should have the same number of columns.
How to apply a function to each element of a matrix?
We can apply a function to each element of a Matrix, or only to specific dimensions, using apply (). apply(X, MARGIN, FUN.) MARGIN is a vector giving the subscripts which the function will be applied over. For a matrix 1 indicates rows, 2 indicates columns, c (1,2) indicates rows and columns.
What are the arguments for the apply function in R?
Arguments – The arguments for the apply function in R are explained below: X – an array, including a matrix. … – optional arguments to FUN. FUN – The function to apply: see ‘Details’. MARGIN – Functions will apply on subscripts in a vector.