HP 35s HP 35s scientific calculator - User Guide - Page 130
Interrupting a SOLVE Calculation, Choosing Initial Guesses for SOLVE, The Y-register press
UPC - 000000000000
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The Y-register (press ) contains the previous estimate for the root or equals to zero. This number should be the same as the value in the X-register. If it is not, then the root returned was only an approximation, and the values in the X- and Y-registers bracket the root. These bracketing numbers should be close together. The Z- register (press again) contains D-value of the equation at the root. For an exact root, this should be zero. If it is not zero, the root given was only an approximation; this number should be close to zero. If a calculation ends with the the calculator could not converge on a root. (You can see the value in the X-register - the final estimate of the root - by pressing or to clear the message.) The values in the X- and Y-registers bracket the interval that was last searched to find the root. The Z-register contains the value of the equation at the final estimate of the root. If the X- and Y-register values aren't close together, or the Z-register value isn't close to zero, the estimate from the X-register probably isn't a root. If the X- and Y-register values are close together, and the Z-register value is close to zero, the estimate from the X-register may be an approximation to a root. Interrupting a SOLVE Calculation To halt a calculation, press or , and the message will be shown. The current best estimate of the root is in the unknown variable; use to view it without disturbing the stack, but solving cannot be resumed. Choosing Initial Guesses for SOLVE The two initial guesses come from: The number currently stored in the unknown variable. The number in the X-register (the display). 7-8 Solving Equations