outer() Function in R (4 Examples) | Apply User-Defined Function | Calculate Outer Product of Arrays

R code of this video:

x1 ＜- 1:5 # Create x vector
y1 ＜- 3 # Create y value

output1 ＜- outer(x1, y1, "+") # Apply R outer function
output1 # Print output to RStudio console

x2 ＜- 1:5 # Create x vector (same as in Example 1)
y2 ＜- 3:7 # Create y vector

names(x2) ＜- x2 # Prepare row names of output matrix
names(y2) ＜- y2 # Prepare column names of output matrix

output2 ＜- outer(x2, y2, "+") # Apply R outer function
output2 # Print output to RStudio console

x3 ＜- letters[1:5] # Create x vector with characters
y3 ＜- LETTERS[1:5] # Create y vector with upper case

names(x3) ＜- x3 # Prepare row names of output matrix
names(y3) ＜- y3 # Prepare column names of output matrix

output3 ＜- outer(x3, y3, "paste") # Apply R outer function to characters
output3 # Print output to RStudio console

x4 ＜- 1:5 # Create x vector (same as in Example 1 & 2)
y4 ＜- 3:7 # Create y vector (same as in Example 2)

custom_fun ＜- function(x, y) { # Create custom function in R
z ＜- (x + y)^2
return(z)
}

names(x4) ＜- x4 # Prepare row names of output matrix
names(y4) ＜- y4 # Prepare column names of output matrix

output4 ＜- outer(x4, y4, custom_fun) # Apply R outer function to custom function
output4 # Print output to RStudio console

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