[Scilab-users] Bitget for int64/uint64

[Jan Åge Langeland]

Thank you Samuel

For some reason I get an error message :

--> genlib elementary_functionslib
genlib: Cannot open file ''C:\Program 
Files\scilab-6.1.0\modules\elementary_functions\macros\lib''.
  ans  =  F

Although scinotes("lib") opens the file, so it is there.

Anyway, this works fine:

--> exec bitget.sci;
Warning : redefining function: bitget                  . Use funcprot(0) 
to avoid this message

Regards

Jan


On 2020-02-28 16:25 PM, Samuel Gougeon wrote:
> Hello Jan,
>
> You will find => there 
> <https://codereview.scilab.org/cat/21421%2C2%2Cscilab/modules/elementary_functions/macros/bitget.sci> 
> a fixed version of bitget() for big u-int64 integers.
> You can patch your Scilab 6.1.0 installation in the following way:
>
>   * download and unzip the file. rename it bitget.sci
>   * put bitget.sci in the SCI/elementary_functions/macros directory
>   * Run the following Scilab code in the console:
>     cd SCI/elementary_functions/macros
>     predef clear
>     genlib elementary_functionslib
>     clear bitget
>
> And then test and use bitget in the current session and all 
> forthcoming ones.
>
> Regards
> Samuel
>
> Le 27/02/2020 à 16:17, JLan a écrit :
>> I wonder if i have misunderstood the documentation for bitget, or if this is
>> a bug? It seems to me that numbers > 2^53 are still not handled correctly.
>> --> a=uint64(2^61)
>>   a  =   2305843009213693952
>> --> b=uint64(2^61)+1
>>   b  =   2305843009213693953
>> --> bitget(a,1:64)
>>   ans  =
>>           column 1 to 32
>>    0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
>> 0  0  0  0  0  0  0
>>           column 33 to 64
>>    0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
>> 0  0  0  0  1  0  0
>>
>> --> bitget(b,1:64)
>>   ans  =
>>           column 1 to 32
>>    0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
>> 0  0  0  0  0  0  0
>>           column 33 to 64
>>    0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
>> 0  0  0  0  1  0  0
>
>
> _______________________________________________
> users mailing list
> users at lists.scilab.org
> http://lists.scilab.org/mailman/listinfo/users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.scilab.org/pipermail/users/attachments/20200228/f0feb118/attachment.htm>