[Scilab-users] Conditional assignments

[Michael Dunn]

Very cool. What other tricks can one do with %t & %f?

Thanks!


Michael Dunn | Editor-in-Chief
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(415) 947-6096 (USA)
(519) 744-9395 (Canada)
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 <http://www.tech.ubm.com/>






-----Original Message-----
From: Stefan Du Rietz <sdr at durietz.se>
Reply-To: "International users mailing list for Scilab."
<users at lists.scilab.org>
Date: Sunday, April 21, 2013 4:28 PM
To: "International users mailing list for Scilab." <users at lists.scilab.org>
Subject: Re: [Scilab-users] Conditional assignments

>If the interpreter is not smart enough and the vector is large, maybe
>this is faster -- only one computation/element:
>
>index = a<5;
>b = zeros(a);
>b(index) = a(index)^2;
>b(~index) = a(~index)^0.5;
>
>/Stefan
>
>
>On 2013-04-21 21:49, Michael Dunn wrote:
>--------------------
>> Say I want to do an array (vector) assignment, but the formula
>> requires a conditional. Is there a better way to do it than:
>>
>> b = ((a^2).*(a<5)) + ((a^0.5).*(a>=5))
>>
>> which returns a^2 for a<5, and sqrt(a) for a>=5.
>>
>> And ­ just curious ­ if this is the only way, is the interpreter smart
>> enough to not waste its time computing the false expression?
>>
>>
>> Thanks,
>>
>>
>> Michael Dunn | Editor-in-Chief
>> Scope Junction | http://www.scopejunction.com/
>> (415) 947-6096 (USA)
>> (519) 744-9395 (Canada)
>> Skype: MichaelDunn_UBM
>> LinkedIn: http://www.linkedin.com/in/cantares
>> <http://www.tech.ubm.com/>
>>
>>
>>
>>
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