a BCCfi4@shddlZddlmZddlmZddlmZddlm Z dd d Z d d Z d dZ ddZ dddZdS)N)lstsq)float_factorial) convolve1d) axis_slice?convcCs||krtdt|d\}}|dur<|dkr8|d}n|}d|krP|ksZntd|dvrjtd||krt|}|Stj| ||td } |d kr| ddd } t|d d d } | | } t|d } t|||| |<t| | \}} } } |S) a Compute the coefficients for a 1-D Savitzky-Golay FIR filter. Parameters ---------- window_length : int The length of the filter window (i.e., the number of coefficients). polyorder : int The order of the polynomial used to fit the samples. `polyorder` must be less than `window_length`. deriv : int, optional The order of the derivative to compute. This must be a nonnegative integer. The default is 0, which means to filter the data without differentiating. delta : float, optional The spacing of the samples to which the filter will be applied. This is only used if deriv > 0. pos : int or None, optional If pos is not None, it specifies evaluation position within the window. The default is the middle of the window. use : str, optional Either 'conv' or 'dot'. This argument chooses the order of the coefficients. The default is 'conv', which means that the coefficients are ordered to be used in a convolution. With use='dot', the order is reversed, so the filter is applied by dotting the coefficients with the data set. Returns ------- coeffs : 1-D ndarray The filter coefficients. See Also -------- savgol_filter Notes ----- .. versionadded:: 0.14.0 References ---------- A. Savitzky, M. J. E. Golay, Smoothing and Differentiation of Data by Simplified Least Squares Procedures. Analytical Chemistry, 1964, 36 (8), pp 1627-1639. Jianwen Luo, Kui Ying, and Jing Bai. 2005. Savitzky-Golay smoothing and differentiation filter for even number data. Signal Process. 85, 7 (July 2005), 1429-1434. Examples -------- >>> import numpy as np >>> from scipy.signal import savgol_coeffs >>> savgol_coeffs(5, 2) array([-0.08571429, 0.34285714, 0.48571429, 0.34285714, -0.08571429]) >>> savgol_coeffs(5, 2, deriv=1) array([ 2.00000000e-01, 1.00000000e-01, 2.07548111e-16, -1.00000000e-01, -2.00000000e-01]) Note that use='dot' simply reverses the coefficients. >>> savgol_coeffs(5, 2, pos=3) array([ 0.25714286, 0.37142857, 0.34285714, 0.17142857, -0.14285714]) >>> savgol_coeffs(5, 2, pos=3, use='dot') array([-0.14285714, 0.17142857, 0.34285714, 0.37142857, 0.25714286]) >>> savgol_coeffs(4, 2, pos=3, deriv=1, use='dot') array([0.45, -0.85, -0.65, 1.05]) `x` contains data from the parabola x = t**2, sampled at t = -1, 0, 1, 2, 3. `c` holds the coefficients that will compute the derivative at the last position. When dotted with `x` the result should be 6. >>> x = np.array([1, 0, 1, 4, 9]) >>> c = savgol_coeffs(5, 2, pos=4, deriv=1, use='dot') >>> c.dot(x) 6.0 z*polyorder must be less than window_length.Nrg?z4pos must be nonnegative and less than window_length.)rdotz`use` must be 'conv' or 'dot')dtyperr) ValueErrordivmodnpZzerosarangefloatreshaperr) window_length polyorderderivdeltaposZusehalflenremcoeffsxorderAy_r X/var/www/html/django/DPS/env/lib/python3.9/site-packages/scipy/signal/_savitzky_golay.py savgol_coeffss.\  r"cCs|dkr|}nt|}||kr6t|dddf}nd|d| }t|D]D}t||d||dd}||||fd|jd9}qP|}|S)aHDifferentiate polynomials represented with coefficients. p must be a 1-D or 2-D array. In the 2-D case, each column gives the coefficients of a polynomial; the first row holds the coefficients associated with the highest power. m must be a nonnegative integer. (numpy.polyder doesn't handle the 2-D case.) rNr.r )r)lenrZ zeros_likecopyrangerrndim)pmresultnZdpkrngr r r!_polyders  $r-c Cst||||d} |dks$||j kr.| } d} n| |d} d} | | jdd} ttd||| |} |dkr|t| |} t||||}t | |dd||}t | j}|||d|d<||<|j||g|ddR}| r|d|}t| |||d}||d<dS) aE Given an N-d array `x` and the specification of a slice of `x` from `window_start` to `window_stop` along `axis`, create an interpolating polynomial of each 1-D slice, and evaluate that polynomial in the slice from `interp_start` to `interp_stop`. Put the result into the corresponding slice of `y`. )startstopaxisrFTr rN.) rr&ZswapaxesrshaperZpolyfitrr-Zpolyvallist)rZ window_startZ window_stopZ interp_startZ interp_stopr0rrrrZx_edgeZxx_edgeZswappedZ poly_coeffsivaluesZshpZy_edger r r! _fit_edges*     r5c CsR|d}t|d|d|||||| |j|}t|||||||||||| dS)z Use polynomial interpolation of x at the low and high ends of the axis to fill in the halflen values in y. This function just calls _fit_edge twice, once for each end of the axis. r rN)r5r1) rrrrrr0rrr*r r r!_fit_edges_polyfits r6r interpc Cs|dvrtdt|}|jtjkr>|jtjkr>|tj}t||||d}|dkr||j|krltdt |||dd} t ||||||| nt |||||d} | S) a Apply a Savitzky-Golay filter to an array. This is a 1-D filter. If `x` has dimension greater than 1, `axis` determines the axis along which the filter is applied. Parameters ---------- x : array_like The data to be filtered. If `x` is not a single or double precision floating point array, it will be converted to type ``numpy.float64`` before filtering. window_length : int The length of the filter window (i.e., the number of coefficients). If `mode` is 'interp', `window_length` must be less than or equal to the size of `x`. polyorder : int The order of the polynomial used to fit the samples. `polyorder` must be less than `window_length`. deriv : int, optional The order of the derivative to compute. This must be a nonnegative integer. The default is 0, which means to filter the data without differentiating. delta : float, optional The spacing of the samples to which the filter will be applied. This is only used if deriv > 0. Default is 1.0. axis : int, optional The axis of the array `x` along which the filter is to be applied. Default is -1. mode : str, optional Must be 'mirror', 'constant', 'nearest', 'wrap' or 'interp'. This determines the type of extension to use for the padded signal to which the filter is applied. When `mode` is 'constant', the padding value is given by `cval`. See the Notes for more details on 'mirror', 'constant', 'wrap', and 'nearest'. When the 'interp' mode is selected (the default), no extension is used. Instead, a degree `polyorder` polynomial is fit to the last `window_length` values of the edges, and this polynomial is used to evaluate the last `window_length // 2` output values. cval : scalar, optional Value to fill past the edges of the input if `mode` is 'constant'. Default is 0.0. Returns ------- y : ndarray, same shape as `x` The filtered data. See Also -------- savgol_coeffs Notes ----- Details on the `mode` options: 'mirror': Repeats the values at the edges in reverse order. The value closest to the edge is not included. 'nearest': The extension contains the nearest input value. 'constant': The extension contains the value given by the `cval` argument. 'wrap': The extension contains the values from the other end of the array. For example, if the input is [1, 2, 3, 4, 5, 6, 7, 8], and `window_length` is 7, the following shows the extended data for the various `mode` options (assuming `cval` is 0):: mode | Ext | Input | Ext -----------+---------+------------------------+--------- 'mirror' | 4 3 2 | 1 2 3 4 5 6 7 8 | 7 6 5 'nearest' | 1 1 1 | 1 2 3 4 5 6 7 8 | 8 8 8 'constant' | 0 0 0 | 1 2 3 4 5 6 7 8 | 0 0 0 'wrap' | 6 7 8 | 1 2 3 4 5 6 7 8 | 1 2 3 .. versionadded:: 0.14.0 Examples -------- >>> import numpy as np >>> from scipy.signal import savgol_filter >>> np.set_printoptions(precision=2) # For compact display. >>> x = np.array([2, 2, 5, 2, 1, 0, 1, 4, 9]) Filter with a window length of 5 and a degree 2 polynomial. Use the defaults for all other parameters. >>> savgol_filter(x, 5, 2) array([1.66, 3.17, 3.54, 2.86, 0.66, 0.17, 1. , 4. , 9. ]) Note that the last five values in x are samples of a parabola, so when mode='interp' (the default) is used with polyorder=2, the last three values are unchanged. Compare that to, for example, `mode='nearest'`: >>> savgol_filter(x, 5, 2, mode='nearest') array([1.74, 3.03, 3.54, 2.86, 0.66, 0.17, 1. , 4.6 , 7.97]) )ZmirrorconstantZnearestr7wrapz@mode must be 'mirror', 'constant', 'nearest' 'wrap' or 'interp'.)rrr7zOIf mode is 'interp', window_length must be less than or equal to the size of x.r9)r0mode)r0r;cval) r rZasarrayr Zfloat64Zfloat32Zastyper"r1rr6) rrrrrr0r;r<rrr r r! savgol_filtersf  r=)rrNr)rrr r7r8)numpyrZ scipy.linalgrZscipy._lib._utilrZ scipy.ndimagerZ _arraytoolsrr"r-r5r6r=r r r r!s      ,