Python | Numpy np.lagvander() method Last Updated : 29 Dec, 2019 Comments Improve Suggest changes Like Article Like Report With the help of np.lagvander() method, we can get the Pseudo-Vandermonde matrix from given array having degree which is passed as parameter by using np.lagvander() method. Syntax : np.lagvander(arr, degree) Parameters: arr :[ array_like ] Array of points. The dtype is converted to float64 or complex128 depending on whether any of the elements are complex. If x is scalar it is converted to a 1-D array deg :[int] Degree of the resulting matrix. Return : Return the matrix having size i.e array.size + (degree + 1). Example #1 : In this example we can see that by using np.lagvander() method, we are able to get the pseudo-vandermonde matrix using this method. Python3 1=1 # import numpy import numpy as np import numpy.polynomial.laguerre as geek # using np.lagvander() method gfg = geek.lagvander((1, 3, 5, 7), 2) print(gfg) Output : [[ 1. 0. -0.5] [ 1. -2. -0.5] [ 1. -4. 3.5] [ 1. -6. 11.5]] Example #2 : Python3 1=1 # import numpy import numpy as np import numpy.polynomial.laguerre as geek # using np.lagvander() method gfg = geek.lagvander((2, 5, 1, 12), 5) print(gfg) Output : [[ 1. -1. -1. -0.33333333 0.33333333 0.73333333] [ 1. -4. 3.5 2.66666667 -1.29166667 -3.16666667] [ 1. 0. -0.5 -0.66666667 -0.625 -0.46666667] [ 1. -11. 49. -107. 97. 27.4 ]] Comment More infoAdvertise with us Next Article Python | Numpy np.lagvander() method jana_sayantan Follow Improve Article Tags : Python Python-numpy Python numpy-Mathematical Function Practice Tags : python Similar Reads Python | Numpy np.lagvander2d() method With the help of np.lagvander2d() method, we can get the Pseudo-Vandermonde matrix from given array having degree which is passed as parameter by using np.lagvander2d() method. Syntax : np.lagvander2d(x, y, deg) Parameters: x, y :[ array_like ] Array of points. The dtype is converted to float64 or c 2 min read Python | Numpy np.lagvander3d() method np.lagvander3d() method is used to returns the Vandermonde matrix of degree deg and sample points x, y and z. Syntax : np.lagvander3d(x, y, z, deg) Parameters: x, y, z :[ array_like ] Array of points. The dtype is converted to float64 or complex128 depending on whether any of the elements are comple 2 min read Python | Numpy np.legvander() method np.legvander() method is used to returns the Vandermonde matrix of degree deg and sample points x. Syntax : np.legvander(x, deg) Parameters: x :[ array_like ] Array of points. The dtype is converted to float64 or complex128 depending on whether any of the elements are complex. If x is scalar it is c 1 min read Python | Numpy np.lagder() method np.lagroots() method is used to differentiate a Laguerre series. Syntax : np.lagder(c, m=1, scl=1, axis=0) Parameters: c :[array_like] 1-D arrays of Laguerre series coefficients ordered from low to high. m :[int, optional] Number of derivatives taken, must be non-negative.Default is 1. scl :[scalar, 1 min read Python | Numpy np.legvander3d() method np.legvander3d() method is used to returns the Vandermonde matrix of degree deg and sample points x, y and z. Syntax : np.legvander3d(x, y, z, deg) Parameters: x, y, z :[ array_like ] Array of points. The dtype is converted to float64 or complex128 depending on whether any of the elements are comple 2 min read Like