R for Data Analysis by Mike McGrath

Author:Mike McGrath
Language: eng
Format: epub, azw3
Publisher: In Easy Steps
Published: 2018-02-03T05:00:00+00:00

A matrix in R resembles a multi-dimensional array structure found in other programming languages.

Begin an R Script by creating a vector containing a sequence of 32 integer values

data <- seq( 1:32 )

FirstMatrix.R

Next, create a matrix that stores the vector values in tabular format, then output the matrix to see the cells

table <- matrix( data, nrow=4, ncol=8 )

print( table )

Now, confirm the type of structure storing the values

cat( “\nVector?:”, is.vector( table ) ,

“\tMatrix?:”, is.matrix( table ) )

Retrieve a cell value, then assign a new value to that cell

cat( “\n\nCell 4,5 Contains:”, table[ 4, 5 ] )

table[ 4, 5 ] <- 10

Finally, search all cells for a specific value, and identify the location of cells that do contain that value

cell <- which( table == 10, arr.ind=TRUE )

cat( “\n\nValue 10 Search:\n” )

print( cell )

Run the code to see the cell values and search result

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