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Right side of equations, inequalities, relations, intervals, ranges and tables






rhs(f) returns the right side of f.

The call rhs(f) is equivalent to the direct call op(f,2), of the operand function op, if f is not a table.

If t is a table, the call rhs(t) returns the list of values of the table (right side). Note that the ith value in rhs(t) corresponds to the ith key in lhs(t).


Example 1

Extract the right sides of various objects:

rhs(a <= b), rhs(m-1..n+1)

The operands of an expression depend on its internal representation. In particular, a "greater" relation is always converted to the corresponding "less" relation:

y > -infinity;
rhs(y > -infinity)

y >= 4;
rhs(y >= 4)

Example 2

Extract the right sides of the solution of the following system:

s := solve({x + y = 1, 2*x - 3*y = 2})

map(op(s), rhs)

Calls to rhs can be easier to read than the equivalent calls to the operand function op:

map(op(s), op, 2)

However, direct calls to op must be preferred inside procedures for higher efficiency.

delete s:

Example 3

Extract the keys (left side) and values (right side) from a table:

t := table(1=2, 4=PI, 5=5.6, 19=1/2):
l := lhs(t);

r := rhs(t);

Note that the ith value corresponds to the ith key:

bool(r = map(lhs(t), e->t[e]))

delete t,l,r:



An equation x = y, an inequality x <> y, a relation x < y, a relation x <= y, an "is element of"-relation x in y, an interval x...y, a range x..y, or a table table(x=y,...)

Overloaded By


See Also

MuPAD Functions

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