Subset rows using variable expression or index.
Subsets a table row-wise, using either an index vector or an expression involving obj’s variables.
If the argument is a numeric or logical vector, it is interpreted as an index into the rows of this. (Just as with ‘subsetrows (this, index)‘.)
If the argument is a char, then it is evaulated as an M-code expression,
with all of this’ variables available as workspace variables, as with
evalWithVars. The output of expr must be a numeric or logical index
vector (This form is a shorthand for
out = subsetrows (this, evalWithVars (this, expr)).)
TODO: Decide whether to name this to "where" to be more like SQL instead of relational algebra.
[s,p,sp] = table_examples.SpDb; prettyprint (restrict (p, 'Weight >= 14 & strcmp(Color, "Red")'))