Appendix E: A Detailed Look at f 257
Obtaining the Current Approximation to an Integral
When the calculation of an integral is requiring more time than you care to wait, you may want to stop and display the current approximation. You can obtain the current approximation, but not its uncertainty.
Pressing ¦ while the
¦again starts the calculation from the program line at which it was stopped.
The f algorithm updates the current approximation and stores it in the LAST X register after evaluating the function at each new sample point. To obtain the current approximation, therefore, simply halt the calculator,
While the calculator is updating the current approximation, the display is blank and does not show running. (While the calculator is executing your function subroutine, running is displayed.) Therefore, you might avoid having to
In summary, to obtain the current approximation to an integral, follow the steps below.
1.Press ¦ to halt the calculator, preferably while the display is blank.
2.When the calculator halts, switch to Program mode to check the current program line.
∙If that line contains the subroutine label, return to Run mode and view the LAST X register (step 3).