Collect

Collect(expr, variable)

collect subexpressions in expr which belong to the same variable.

Collect(expr, variable, head)

collect subexpressions in expr which belong to the same variable and apply head on these subexpressions.

Collect additive terms of an expression.

This function collects additive terms of an expression with respect to a list of expression up to powers with rational exponents. By the term symbol here are meant arbitrary expressions, which can contain powers, products, sums etc. In other words symbol is a pattern which will be searched for in the expression’s terms.

Examples

>> Collect(a*x^2 + b*x^2 + a*x - b*x + c, x)
c+(a-b)*x+(a+b)*x^2

>> Collect(a*Exp(2*x) + b*Exp(2*x), Exp(2*x))
(a+b)*E^(2*x)

>> Collect(x^2 + y*x^2 + x*y + y + a*y, {x, y})
(1+a)*y+x*y+x^2*(1+y)

Implementation status

• ✅ - full supported

Github

• Implementation of Collect