R -Error: “argument is of length zero” in an expression

This is an error which happens when you compare something to NULL.
When you compare some values in the R the result is expected to be either TRUE or FALSE.
However the result of the expression is not defines then R gives output as logical (0) and if this expression is used in IF condition, whenever the condition encounters logical (0) it will throw error as “Error in if (*expression) { : argument is of length zero”.
Below examples will make it clearer:



To avoid this error please make sure that the expression never returns logical (0) OR logical (1).

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