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Infinity constants on WP-34s



#2

The manual (3.1) says that the constants positive and negative infinity are considered numeric values.

However, if I try using them as limits to the integrate operator, I get a "not numeric" error.

Is this a bug or by design?


#3

By design.

The integration code cannot handle infinite limits, so they are disallowed. There are transforms that can be used to reduce the limits to something finite -- old HP manuals detail one procedure.


- Pauli


#4

Out of curiosity, are there any functions on the WP-34s where the infinity constants can actually be used?


#5

Yes, plenty. Two easy ones: e-infinity gives zero and TANH(infinity) is one.

If you are going to start playing with infinities on the 34S, make sure you set the D flag.


- Pauli

#6

Also stuff like 1/infinity = zero and 1/-infinity = - zero.

- Pauli


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