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Validate a Condition
validate(expr)
Returns NULL on success, otherwise returns the error as a string.
NULL
An object to be evaluated.
N. Frerebeau
Other validation methods: check-attribute, check-data, check-matrix, check-numeric-comparison, check-numeric-trend, check-numeric, check-type, needs()
check-attribute
check-data
check-matrix
check-numeric-comparison
check-numeric-trend
check-numeric
check-type
needs()