MATRIX OPERATIONS (Manipulations, Combining, Length, etc.) IN R-PROGRAMMING|| DATA STRUCTURES IN R
Operations on Matrix
1. Add rows & cols
Rows - rbind(matrix_name,data)
Cols - cbind(matrix_name,data)
2. Deleting rows & cols
Single element - matrix[-c(index)]
Entire Row - matrix[-c(row_num),]
Entire Col - matrix[,-c(col_num)]
Multiple rows & cols - matrix[-c(row_num),-c(col_num)]
3. Searching an element
in - membership operator
element %in% matrix_name
4. Dimension of matrix
dim(matrix_name) - it will display rows followed by columns
5. Length of matrix
length(matrix_name) - it will display total number of elements in matrix.
6. Finding number of rows & number of columns
nrow(matrix_name) - return number of rows
ncol(matrix_name) - return number of cols
7. Loop the matrix elements
for(row in 1:nrow(m))
{
for(col in 1:ncol(m))
{
matrix[row,col]
}
}
8. Combining two matrices
m1
m2
res=rbind(m1,m2)
res=cbind(m1,m2)
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R PROGRAMMING
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