In Maple, for loops and while loops must be terminated with end do (or od). This error occurs when there is no end do or od statement to terminate the loop.

Example 1

In the following example, the for loop contains only a controlling clause, and does not contain an end do or od statement to terminate the loop.

Solution:

Complete the statement and add end do or od to the end of the loop.

Example 2
The following example contains a loop that is intended to return a floating-point approximation to the sine function at the angles (measured in degrees) in the list L. However, pressing Enter to insert line breaks (and not Shift + Enter) after the controlling clause in the for loop generates an error.

Solution

To correct this error, press Shift + Enter to insert line breaks within the loop body instead of simply pressing Enter. Terminate the for loop with either an end do or an od statement.