[ncl-talk] Extracting bit information using 'dim_gbits'..

[Dennis Shea]

I am not sure I understand but ...
Let  us(226,4350)  be of type unsigned short

[1] step-by-step

    us         = f->UnsignedShort
    printVarSummary(us)

    dim_us = *dimsizes*(us)
    nleft      = dim_us(0)          ; 226
    nright    = dim_us(1)          ; 4350

    ibit         = 9                        ; skip 9 bits
    nbit        = 3                        ; 10-12
    nskip      = 16                     ; all 'short' are 16 bits
    N            = nleft*nright

    us_1d     = *ndtooned*(us),
    ubit_1d   = *dim_gbits*(us_1d, ibit, nbit, nskip, N)
    ubit         = *reshape*(ubit_1d, (/nleft,nright/) )
    *delete*(us_1d, ubit_1d)       ; clean up; not really necessary


[2} slicker but less clear

    ubit = reshape( *dim_gbits(**ndtooned*(us), ibit, nbit, nskip, N),
*product*(*dimsizes*(us)) )

[3] As always

        * printVarSummary*(ubit)
         *printMinMax*(ubit, 0)

Good Luck

On Wed, May 3, 2017 at 2:19 AM, qudsia zafar <missquaddus at gmail.com> wrote:

> Hi,
>
> I am working with a 2-D array [226 x 4350] of type 'ushort' consisting of
> 16-bit integers. I want to extract bits 1-3 in correspondence with bits
> 10-12 from the array. i have seen the function 'dim_gbits' but am confused
> in setting the function parameters such as *ibit*, *nbits *and *nskip. *
>
> Would very much appreciate the help in this regard.
>
> Sincerely,
> qudsia
>
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