Use switch() instead of ifelse() to return a NULL
Have you ever tried to return a
NULL with the
ifelse() function? This function is a simple vectorized workflow for conditional statements. However, one can’t just return a
NULL value as a result of this evaluation. Check a tricky workaround solution in this post.
Imagine a simple
R logical statement like
and depending on that logical value you would like to create a new variable called
res. You can follow a regular
if conditional statement
or use simplified interface with
However it looks like one is not able to return the
NULL as a result of this operation.
A solution is to jump to the other conditional function called
switch(), which for the first parameter takes number (
n) and returns the value passed as the
n-th parameter. If one treats logical values as
TRUE is 1 and
FALSE is 0 then primary
ifelse() statement can be rebuild to
switch() call like
What do you think about such workaround? Do you use other solutions for such a situation?
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