Re: Not sure this limit is right...
- To: mathgroup at smc.vnet.net
- Subject: [mg131113] Re: Not sure this limit is right...
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Wed, 12 Jun 2013 05:38:32 -0400 (EDT)
- Delivered-to: email@example.com
- Delivered-to: firstname.lastname@example.org
- Delivered-to: email@example.com
- Delivered-to: firstname.lastname@example.org
On 6/11/13 at 2:32 AM, bernardsarman at gmail.com (Bernard Sarman) wrote: >Yes, that's what I meant. > >I have another, related question: 9^-9^9 seems to explode on my >machine. The memory jumps to over 1 GB, and I have to abort the >evaluation. I have no idea why Mathematica would require so much >memory to evaluate this expression. 9^9 evaluates to 387420489. That is you are computing an *exact* value with a bit less than 400 million digits. You should expect each digit to take require at least 4 bytes (assumes 32 bit integers). So the number you are computing requires around 1 GB to store. Perhaps you want to compute 9^-9^9. Notice the decimal point with tells Mathematica to use a machine precision value. That expression will evaluate quickly and not require much storage at all.