Mathematica Tutorial: Notebooks And Documents - Wolfram Research

Notebooks and Documents 37Shift +Returnevaluate the whole current cellShift+Ctrl+Enter (Windows/Unix/Linux) or Cmd+Return (Mac OS X)evaluate only the selected subexpressionWays to evaluate two-dimensional expressions.In most computations, you will want to go from one step to the next by taking the whole expressionthat you have generated, and then evaluating it. But if for example you are trying to manipulatea single formula to put it into a particular form, you may instead find it more convenientto perform a sequence of operations separately on different parts of the expression.You do this by selecting each part you want to operate on, then inserting the operation youwant to perform, then using Shift+Ctrl+Enter for Windows/Unix/Linux or Cmd+Return for MacOS X.Here is an expression with one part selected.Pressing Shift+Ctrl+Enter (Windows/Unix/Linux) or Cmd+Return (Mac OS X) evaluates the selectedpart.The Basic Commands y=x tab in the Basic Math Assistant, Classroom Assistant, andWriting Assistant palettes also provides a number of convenient operations which will transformin place any selected subexpression.