HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 261

hp40g+.book Page 9 Friday, December 9, 2005 1:03 AM Select the fifth branch by pressing . At this point, the desired expression is in the Equation Writer, as shown at the right. Suppose that you want to select the second and third branches, that is: 1-- + 1-- . First press 34 the second term. . This selects 1-- , 3 Now press . This key combination enables you to select two contiguous branches, the one already selected and the one to the right of it. If you want, you can evaluate the selected part by pressing . The result is shown at the right. Suppose now you want to perform the partial calculation: 1-2 + 1-5 Because the two terms in this partial calculation are not contiguous (that is, side by side), you must first perform a permutation so that they are side by side.To do this, press: This exchanges the selected element with its neighbour to the left. The result is shown at the right. Now press: to select just the branches you are interested in: Equation Writer 15-9