# [ncl-talk] Problem with the function "lspoly" : difference between the result

Thu Jan 11 02:15:57 MST 2018

```Hi, Mary

from the web page

Lin

> 在 2018年1月10日，下午11:25，Mary Haley <haley at ucar.edu> 写道：
>
> ​Lin,
>
> It seems like an issue, but I'm unable to run your script because I don't have the HadCRUT4_ensemble.median_Ann_Global.txt file?​ Can you include this?
>
> Thanks,
>
> --Mary​
>
> On Tue, Jan 9, 2018 at 9:40 PM, 林祥 via ncl-talk <ncl-talk at ucar.edu <mailto:ncl-talk at ucar.edu>>wrote:
> Hi, all
>
>      I just use the function “lspoly” to do polynomial fitting for some series, and met something strange .
> Here below is a part of my scripts
>
> …….
> ;  ***********************************
>     tstep = ispan(-maxlag,maxlag,1)                   ; define x axis
>
> ;  polynomial interpolation
>    c       = lspoly(tstep,ccrtot,1,3)
>
>    do k = 0,nd-1
>       print(k + "  " + xid(k) )
>       cc  = lspoly(tstep,ccrtot(k,:),1,3)
>       print(c(k,0)  +  "  " + cc(0))
>    end do
> ;   ***********************************
>
> Here below is a part of the corresponding output.
> We  can see that for most of the series, the result is consistent between c(k,0) and cc(0),
> however, for the other series , for example, the series with the id of “CA002202200” or “CA002204100”,
> there are difference between c(k,0) and cc(0).
>
> I am a little puzzled, why there are difference for the results of these series
> when I change the procedure of calling function. And Which way should I choose
> to got the correct polynomial fitting for all the series. (I also attached the
> whole scripts and data files, Please check it.)
>
> (0)	0  CA002100700
> (0)	0.239934  0.239934
> (0)	1  CA002100880
> (0)	0.380426  0.380426
> (0)	2  CA002202200
> (0)	0.380426  0.415303
> (0)	3  CA002202400
> (0)	0.328062  0.328062
> (0)	4  CA002202800
> (0)	0.233068  0.233068
> (0)	5  CA002204100
> (0)	0.233068  0.341998
> (0)	6  CA002300500
> (0)	0.233068  0.500022
> (0)	7  CA002300902
> (0)	0.233068  0.50636
> (0)	8  CA002301000
> (0)	0.477951  0.477951
> (0)	9  CA002400600
> (0)	0.477951  0.482882
> (0)	10  CA002401200
> (0)	0.619622  0.619622
> (0)	11  CA002403500
> (0)	0.557136  0.557136
> (0)	12  CAW00711410
> (0)	0.448455  0.448455
> (0)	13  CAW00719110
> (0)	0.550481  0.550481
> (0)	14  FI000000304
> (0)	0.511676  0.511676
> (0)	15  FI000002401
> (0)	0.511676  0.525073
> (0)	16  FI000007501
> (0)	0.511676  0.609115
> (0)	17  FIW00028050
> (0)	0.511676  0.539957
> (0)	18  FIW00028070
> (0)	0.55604  0.55604
> (0)	19  FIW00028230
> (0)	0.571857  0.571857
> (0)	20  FIW00028440
> (0)	0.571857  0.660955
> (0)	21  FIW00028450
> (0)	0.614022  0.614022
> (0)	22  FIW00028640
> (0)	0.561348  0.561348
> (0)	23  FIW00028690
> (0)	0.566393  0.566393
> (0)	24  FIW00028740
> (0)	0.553346  0.553346
> (0)	25  FIW00028750
> (0)	0.507437  0.507437
> (0)	26  FIW00028970
> (0)	0.464211  0.464211
> (0)	27  FIW00029100
> (0)	0.530141  0.530141
> (0)	28  FIW00029110
> (0)	0.452507  0.452507
> (0)	29  FIW00029130
> (0)	0.452507  0.585739
> (0)	30  FIW00029150
> (0)	0.452507  0.481584
> (0)	31  FIW00029170
> (0)	0.488413  0.488413
> (0)	32  FIW00029240
> (0)	0.487094  0.487094
> (0)	33  FIW00029290
> (0)	0.523639  0.523639
> (0)	34  FIW00029420
> (0)	0.531159  0.531159
> (0)	35  FIW00029440
> (0)	0.471023  0.471023
> (0)	36  FIW00029450
> (0)	0.495872  0.495872
> (0)	37  FIW00029470
> (0)	0.327738  0.327738
> (0)	38  FIW00029520
> (0)	0.489859  0.489859
> (0)	39  FIW00029580
> (0)	0.467005  0.467005
> (0)	40  FIW00029650
> (0)	0.467005  0.493549
> (0)	41  FIW00029660
> (0)	0.467005  0.542049
> (0)	42  FIW00029700
> (0)	0.494033  0.494033
> (0)	43  FIW00029720
> (0)	0.407923  0.407923
> (0)	44  FIW00029760
> (0)	0.502163  0.502163
> (0)	45  FOW00060110
> (0)	0.502163  0.553852
> (0)	46  GL000004360
> (0)	0.672092  0.672092
> (0)	47  GLW00042200
> (0)	0.511462  0.511462
> (0)	48  GLW00042600
> (0)	0.373208  0.373208
> (0)	49  GLW00042720
> (0)	0.50284  0.50284
> (0)	50  IC000004030
> (0)	0.713142  0.713142
> (0)	51  IC000004048
> (0)	0.671089  0.671089
> (0)	52  IC000004097
> (0)	0.581897  0.581897
> (0)	53  ICW00040050
> (0)	0.603685  0.603685
> (0)	54  NO000001026
> (0)	0.602763  0.602763
> (0)	55  NO000050540
> (0)	0.513178  0.513178
> (0)	56  NO000080700
> (0)	0.513178  0.620591
> (0)	57  NO000099710
> (0)	0.612189  0.612189
> (0)	58  NOE00105467
> (0)	0.612189  0.645705
> (0)	59  NOE00105477
> (0)	0.693077  0.693077
> (0)	60  NOE00105494
> (0)	0.635884  0.635884
> (0)	61  NOE00109394
> (0)	0.562202  0.562202
> (0)	62  NOE00109450
> (0)	0.445114  0.445114
> (0)	63  NOE00109459
> (0)	0.445114  0.592654
> (0)	64  NOE00109476
> (0)	0.535851  0.535851
> (0)	65  NOE00109485
> (0)	0.535851  0.595297
> (0)	66  NOE00109514
> (0)	0.527777  0.527777
> (0)	67  NOE00109604
> (0)	0.527777  0.541985
> (0)	68  NOE00109701
> (0)	0.579877  0.579877
>
> Thanks
>
>
>
> Lin
>
>
>
>
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