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suggestion for alternate syntax for table indexing

I have an idea for a feature request, but I thought I'd toss it out to this group first for feedback, in case it's already been done or if it's just a dumb idea for any reason. I'd like to be able to...

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Re: suggestion for alternate syntax for table indexing

On 04/06/2017 3:01 PM, Bruce Elliott wrote: ...> I'd like to be able to index into rows of a table using logical indexing> on certain values in the table. Since the variables are in the table,...

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efficiency using categorical data

I've been experimenting with converting some older code to use categorical data to reduce memory use, but it seems to be causing unexpected slow-down in processing time. I'm wondering if this is...

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Re: efficiency using categorical data

On 04/11/2017 1:49 PM, Bruce Elliott wrote: ..> Does all this sound correct? Should I expect a slow-down in processing> categorical data in exchange for less memory use? "There is no free lunch"....

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Re: efficiency using categorical data

"dpb" wrote in message <ocjbvg$rsr$1@dont-email.me>...> "There is no free lunch". I have observed that categorical are slow > even with just some small toy datasets. I think it's likely...

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Re: efficiency using categorical data

"Bruce Elliott" wrote in message <ocldp3$akt$1@newscl01ah.mathworks.com>...> "dpb" wrote in message <ocjbvg$rsr$1@dont-email.me>...> > "There is no free lunch". I have observed...

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Re: efficiency using categorical data

On 04/12/2017 10:48 AM, Yair Altman wrote: ...> Categorical data and tables in general use more memory and are less> performant than the corresponding implementation using simple arrays. So>...

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Re: efficiency using categorical data

"Yair Altman" wrote in message <ocli7j$k5c$1@newscl01ah.mathworks.com>...> Categorical data and tables in general use more memory and are less performant than the corresponding implementation...

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Re: efficiency using categorical data

On 04/12/2017 1:21 PM, Bruce Elliott wrote:> "Yair Altman" wrote in message <ocli7j$k5c$1@newscl01ah.mathworks.com>...>> Categorical data and tables in general use more memory and are...

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Re: efficiency using categorical data

"Bruce Elliott" wrote in message <oclr6e$a7l$1@newscl01ah.mathworks.com>...> "Yair Altman" wrote in message <ocli7j$k5c$1@newscl01ah.mathworks.com>...> > Categorical data and...

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Re: efficiency using categorical data

On 04/12/2017 3:05 PM, Yair Altman wrote: ...> ... This goes back to my> point that the real tradeoff here is maintainability and dev time/cost> vs. performance and memory. There are no free...

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Re: efficiency using categorical data

"Yair Altman" wrote in message <ocm19f$n6v$1@newscl01ah.mathworks.com>...> > Duplicating a long string multiple time is indeed wasteful in memory. Storing a cell array of unique strings and...

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Re: efficiency using categorical data

On 04/12/2017 4:27 PM, Bruce Elliott wrote: ...> It sounds like the benefits for memory efficiency increase with larger> array sizes, but then there might be a performance hit, since the>...

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Re: efficiency using categorical data

I'm coming into this thread kind of late. Let me say a few things here about memory. I'll post separately about performance. On 4/11/17 2:49 PM, Bruce Elliott wrote:> I've been experimenting with...

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Re: efficiency using categorical data

On 4/11/17 2:49 PM, Bruce Elliott wrote:> This works well for memory usage - I'm now using about 10% of the memory> previously used with the non-categorical data - but it's taking far> longer...

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