HP Forum Archive 21

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Infinity constants on WP-34s Message #1 Posted by Marcel Samek on 19 June 2013, 6:24 p.m. 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?

Re: Infinity constants on WP-34s Message #2 Posted by Paul Dale on 19 June 2013, 9:01 p.m., in response to message #1 by Marcel Samek 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

Re: Infinity constants on WP-34s Message #3 Posted by Marcel Samek on 19 June 2013, 9:39 p.m., in response to message #2 by Paul Dale Out of curiosity, are there any functions on the WP-34s where the infinity constants can actually be used?

Re: Infinity constants on WP-34s Message #4 Posted by Paul Dale on 20 June 2013, 12:13 a.m., in response to message #3 by Marcel Samek 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

Re: Infinity constants on WP-34s Message #5 Posted by Paul Dale on 20 June 2013, 12:15 a.m., in response to message #3 by Marcel Samek Also stuff like 1/infinity = zero and 1/-infinity = - zero. - Pauli

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