HP 33s Owner's Manual page 216

Rpn/alg scientific calculator
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2. Select the program that defines the function to integrate: press
label. (You can skip this step if you're reintegrating the same program.)
3. Enter the limits of integration: key in the lower limit and press
key in the upper limit.
4. Select the variable of integration and start the calculation: press
variable.
Notice that FN= is required if you're integrating a programmed function, but not if
you're integrating an equation from the equation list.
You can halt a running integration calculation by pressing
However, no information about the integration is available until the calculation
finishes normally. To resume the calculation, press
while an integration calculation is running cancels the
you should start
To write a program for
The program can use equations, ALG, and RPN operations — in whatever
combination is most convenient.
1. Begin the program with a label. This label identifies the function that you want
to integrate (  label).
2. Include an INPUT instruction for each variable, including the variable of
integration. INPUT instructions enable you to integrate with respect to any
variable in a multi–variable function. INPUT for the variable of integration is
ignored by the calculator, so you need to write only one program that contains
a separate INPUT instruction for every variable (including the variable of
integration).
If you include no INPUT instructions, the program uses the values stored in the
variables or entered at equation prompts.
3. Enter the instructions to evaluate the function.
A function programmed as a multi–line RPN sequence must calculate the
function values you want to integrate.
A function programmed as an equation is usually included as an
expression specifying the integrand — though it can be any type of
equation. If you want the equation to prompt for variable values instead of
including INPUT instructions, make sure flag 11 is set.
14–8
Solving and Integrating Programs
File name 33s-E-Manual-1008-Publication(1st).doc
Printed Date : 2003/10/8
FN again from the beginning.
FN;
Size : 13.7 x 21.2 cm
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or
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again. Pressing
FN operation. In this case,
Page : 386
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