Re: Smoothing a line

Hi Rodrigo,

I think you are looking for the function runave which calculates an unweighted running average:

http://www.ncl.ucar.edu/Document/Functions/Built-in/runave.shtml

Bye,
Karin

Am 15.04.2014 um 22:01 schrieb Rodrigo Colpo <rodrigocolpo2@yahoo.com.br>:

> Hello Bill,
>
> To better clarify what I would like to do, I attached a graph I made using Excel.
> The blue line is the raw data.
> The black line is a 13 points moving average.
> The red line is the 4th order polynomial function which best fit the blue line.
>
> I would like to make something like the red line using NCL (and them add the 70th and 30th percentile). To do so, I used "lspoly" to have the coefficients for a weighted least squares, them calculated the new values of "y" and used the function "ftcurv" to smooth it. But even when I use "lspoly" to make a 1st order function, the result doesn't look like a 1st order function. Attached the graph I'm having in ".ps" format.
> Is this the right way to do it?
>
> Bellow is the code:
> ;y = raw data
> x = ispan(1,52,1)
> c = lspoly(x, y, 1, 3)
> yo = c(0) + c(1)*y + c(2)*y^2; + c(3)*y^3;
> yo_new = ftcurv(x, yo, fspan(1.,52.,365))
>
> Thank you very much!
> Rodrigo.
>
> Em Segunda-feira, 14 de Abril de 2014 14:33, William Daniel Scheftic <scheftic@email.arizona.edu> escreveu:
> Hi Rodrigo,
>
> If you're just trying to smooth the line but maintain the same temporal spacing then you could use wgt_runave_n. Look at the examples in the function definition http://www.ncl.ucar.edu/Document/Functions/Built-in/wgt_runave_n.shtml for example filters that can be used.
>
> Take Care,
>
> Bill
>
> On 4/14/2014 10:21 AM, Rodrigo Colpo wrote:
>> Dear all,
>>
>> I'm having a problems trying to smooth a line. I read the link
>> http://www.ncl.ucar.edu/Applications/interp1d.shtml
>> and tried to use "lspoly" and "ftcurv", but I could not manage to have a better behaving line.
>>
>> yDays = (/24.9264,-8.361866, -32.16906, 20.60294, 7.384959, 40.00099, -92.79871, 50.42744, -5.070408, 40.27705, -27.88171, -15.03915, 11.47537, -29.03874, -1.756587, -20.16744, 21.60254, -22.96009, 20.59936, -28.42203, 27.0571, 12.97648, -88.9543, 85.17473, -55.08803, 45.47628, 24.15122, -58.92344, 43.25131, -51.89326, 20.54425, 33.07741, -39.74909, -11.37656, 51.00746, -15.13431, 36.12533, -1.521067, -52.99825,12.57256, 28.42521, 3.828768, -53.74265, 26.17332, -9.199653, -2.309943, -29.50837, 41.74754, -10.51091, 31.03505, 4.09079, -43.97025, 31.43508, 10.02173, 41.16813, -2.80632, -79.53146, -20.74533, 59.44746, -49.75961, 39.98883, 10.05335, 0.8409821, -35.33345, 18.40772, -12.2347, 1.105038, 31.84602, -13.8735, -7.891514, 0.3682705, -5.585191, -28.66333, 52.90786, -5.409936, 7.680257, 0.7249982, -40.92494, -25.33436, 23.74692, 57.71513, -32.00339, -16.75868, 23.42031, -4.792629, 37.20881, -4.456624, -23.72248, 7.767448, -21.8565, 26.44745, -29.24916, -6.314954, 30.94873, -13.91431, 21.38537, -37.93886, 26.56374, -32.10296, 47.78776, -0.4801184, -25.8139, 58.57794, -0.7972997, -40.70943, -19.4354, 6.80695, -15.61182, 16.48778, 16.05497, 16.69331, 5.19874, -23.85107, 27.78862, 40.81667, -84.96756, -12.97966, -9.382995, 7.511517, 23.06323,-14.97894, 15.4442, 6.898167, -17.49207, 14.06445, 11.29572, 37.50677, -26.72132, 35.59035, -4.198732, -54.52291, -16.66267, 41.58054, 32.10245, -10.67811, 22.81898, 3.371699, -20.39278, -2.959632, -12.20442, 7.349309, 12.05357, 19.43616, -4.506427, -38.90607, 2.41556, 56.17836,-14.21334, 16.37525, 26.71167, 9.09359, 39.39703, 21.15053, -71.65178, -8.757985, -22.7589, 14.46975, 33.85746, -17.84287, 23.09438, 17.78081, 25.97645, -7.781834, -26.64459, -6.69821, -20.50336, 37.03909, 9.835811, 2.60719, 5.255515, -12.98845, -7.794468, -24.1282, 9.487386, 6.582564, 25.11583, 15.52696, 37.84516, 1.754072, -16.12908, -16.88242, 36.66131, -1.120736, -26.04581, 23.76035, 32.78828, -31.48173, 36.0989, 9.240784, -14.55615, 16.70981, 20.86206, -17.27525, 39.56828, 13.07125, -12.99599, -17.7401, -46.12418, 19.58386, 56.07545, -0.5685795, -0.9008529, -25.9442, -1.752784, 10.51259, 9.666623, 47.25177, -17.35054, 9.756303, -30.42878, 39.36865, 3.802191, 10.75947, -32.46304, 4.70647, -0.3541092, 16.2095, -25.91894, 13.74797, 26.89765, -6.783369, -3.999881, -4.279597, -0.8352942, -29.25169, -13.72089, 20.788, -0.8843041, -9.306261, -1.17004, 8.377829, 40.41809, 18.00184, 23.30745, -21.75604, -51.99948, -8.58614, -16.91891, 24.7299, 3.172685, -19.49131, -14.85031, 10.22103, -51.69467, -0.7927365, 38.09153, 1.860253, 30.74613, -3.257262, 4.002953, 0.2218886, 13.85386, -31.56291, -12.19289, 32.99896, -32.52431, -19.88405, -54.25632, 20.47882, -8.080286, 35.64525, -15.34531, 13.49685, -13.06714, -3.831783, 19.64373, -68.76797, 12.5983, 3.35871, -18.91072, 10.27991, -27.42312, -15.79099, 29.58066, -9.914533, -0.6830215, -9.077754, -9.185384, -25.31908, 67.3791, -30.95538, -22.8384, -25.2431, 17.0081, 66.54207, -16.88133, -16.24662, -36.7114, -25.94501, 23.17612, -45.73708, 30.64136, -18.41788, 40.28629, -54.11975, 44.79348, -35.77917, -7.19503, -13.19775, -12.92189, 24.29116, -16.98229, 49.63627, -6.452826, 11.50777, -64.53977, -5.951408, 37.638, -15.28019, -26.81924, 63.38461, -23.64748, 8.656753, -21.12774, 60.26141, -81.49531, 34.91807, -16.63806, 13.47313, -27.20161, -5.661833, -5.45722, 12.96912, 14.15574, -13.23332, -45.49319, 28.04377, 0.7724994, -17.6555, -20.47201, 28.1443, -14.44097, 23.40522, -0.1788197, -68.70046, 16.8583, 21.12821, 19.91207, -17.77668, -9.989548, -49.73676, 54.32707, -2.146452, -32.35265, 32.95036, 2.574606, -9.437281, -15.56939, -0.3845669, 12.12393, 14.93732, -28.40279, -14.69085, 49.71231, -1.143925, -6.234774, -55.59104, 61.16213, -68.4799, 16.58861, 14.23054, -47.54554, 49.72101, -48.24809, 32.33456/)
>>
>> xDays = ispan(1,365,1)
>>
>>
>> Someone have any idea how can I do this?
>>
>> Best wishes,
>> Rodrigo.
>>
>>
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Received on Tue Apr 15 14:25:38 2014