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For example, study the result of i||7 and a||i||b in the previous examples. The i is evaluated to 5 only if it is not the left-most object in the concatenation. In general, Maple evaluates expressions from left to right. However, Maple evaluates concatenations from right to left. Maple evaluates the right-most operand, then concatenates to the left operand. Example 1 If the right operand evaluates to an integer, string, or name, then the result of the concatenation is a string or name (depending on the type of the left -most operand).

List := [1,2]; Error, attempting to assign to ‘list‘ which is protected The Maple system protects these names from re-assignment. 16 > unprotect(sin); > sin := "a sin indeed"; sin := “a sin indeed” As a result, components of Maple that rely on the sine function do not work properly. constants. You can usually undo assignments made to Maple system names by entering a restart command, or by ending the session. However, in general, it is dangerous to reassign Maple system names; using the unprotect command to modify Maple system names is not recommended.

And : Use the semicolon and the colon to separate statements. The distinction between these marks is that, during an interactive session, a colon prevents the result of the statement from printing. 10): ’’ Enclosing an expression, or part of an expression, in a right single quotes (also called apostrophes) delays evaluation of the expression (subexpression) by one level. For more information, see page 100. > ’’sin’’(Pi); ’sin’(π) > %; sin(π) > %; 0 ‘‘ To form names, enclose an expression in left single quotes.

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