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Numpy Articles
Page 34 of 81
Evaluate a 2-D Hermite_e series on the Cartesian product of x and y with 1d array of coefficient in Python
To evaluate a 2-D Hermite_e series on the Cartesian product of x and y, use the hermite_e.hermegrid2d() method in Python. This method evaluates a two-dimensional Hermite_e polynomial at points formed by the Cartesian product of two arrays. Syntax numpy.polynomial.hermite_e.hermegrid2d(x, y, c) Parameters x, y − Arrays representing the coordinates. The series is evaluated at points in the Cartesian product of x and y c − Array of coefficients ordered so that coefficients for terms of degree i, j are in c[i, j] Basic Example Let's start with a simple example ...
Read MoreDifferentiate a Hermite_e series with multidimensional coefficients over axis 1 in Python
To differentiate a Hermite_e series with multidimensional coefficients, use the hermite_e.hermeder() method in Python. This method allows you to compute derivatives across specific axes of multidimensional coefficient arrays. Parameters The hermite_e.hermeder() method accepts the following parameters: c: Array of Hermite_e series coefficients. For multidimensional arrays, different axes correspond to different variables m: Number of derivatives (default: 1). Must be non-negative scl: Scalar multiplier applied to each differentiation (default: 1) axis: Axis over which the derivative is taken (default: 0) Example: Differentiating Along Axis 1 Let's create a multidimensional coefficient array and differentiate along ...
Read MoreDifferentiate a Hermite_e series with multidimensional coefficients over specific axis in Python
To differentiate a Hermite_e series with multidimensional coefficients, use the hermite_e.hermeder() method in Python. This method allows you to compute derivatives along specific axes of multidimensional coefficient arrays. Syntax numpy.polynomial.hermite_e.hermeder(c, m=1, scl=1, axis=0) Parameters The method accepts the following parameters ? c − Array of Hermite_e series coefficients. For multidimensional arrays, different axes correspond to different variables m − Number of derivatives taken (default: 1). Must be non-negative scl − Scalar multiplier for each differentiation (default: 1). Final result is multiplied by scl**m axis − Axis over which the derivative is taken ...
Read MoreMultiply a Chebyshev series by an independent variable in Python
To multiply a Chebyshev series by an independent variable, use the polynomial.chebyshev.chebmulx() method in NumPy. This method multiplies the Chebyshev polynomial by the variable x, effectively increasing the degree by 1. Syntax numpy.polynomial.chebyshev.chebmulx(c) Parameters c − 1-D array of Chebyshev series coefficients ordered from low to high degree. Basic Example Let's start with a simple example to understand how chebmulx() works ? import numpy as np from numpy.polynomial import chebyshev as C # Create a simple Chebyshev series [1, 2, 3] # This represents: 1*T0(x) + 2*T1(x) + 3*T2(x) ...
Read MoreSubtract one Chebyshev series from another in Python
To subtract one Chebyshev series from another, use the polynomial.chebyshev.chebsub() method in NumPy. The method returns an array of Chebyshev series coefficients representing their difference c1 - c2. The sequences of coefficients are ordered from lowest to highest order term, i.e., [1, 2, 3] represents the series T_0 + 2*T_1 + 3*T_2. Syntax numpy.polynomial.chebyshev.chebsub(c1, c2) Parameters The parameters c1 and c2 are 1-D arrays of Chebyshev series coefficients ordered from low to high degree terms. Basic Example Let's start with a simple example of subtracting two Chebyshev series ? import ...
Read MoreAdd one Chebyshev series to another in Python
To add one Chebyshev series to another, use the polynomial.chebyshev.chebadd() method in Python NumPy. The method returns an array representing the Chebyshev series of their sum. The arguments are sequences of coefficients ordered from lowest order term to highest, i.e., [1, 2, 3] represents the series T_0 + 2*T_1 + 3*T_2. Syntax numpy.polynomial.chebyshev.chebadd(c1, c2) Parameters c1, c2 − 1-D arrays of Chebyshev series coefficients ordered from low to high. Basic Example Let's start with a simple example of adding two Chebyshev series ? import numpy as np from numpy.polynomial import ...
Read MoreRemove small trailing coefficients from a polynomial in Python
To remove small trailing coefficients from a polynomial, use the polynomial.polytrim() method in Python NumPy. The method returns a 1-d array with trailing zeros removed. If the resulting series would be empty, a series containing a single zero is returned. The "Small" means "small in absolute value" and is controlled by the parameter tol; "trailing" means highest order coefficient(s). For example, in [0, 1, 1, 0, 0] (which represents 0 + x + x² + 0*x³ + 0*x⁴), both the 3rd and 4th order coefficients would be "trimmed". The parameter c is a 1-d array of coefficients, ordered from ...
Read MoreGet the Least-squares fit of a polynomial to data in Python
To get the least-squares fit of a polynomial to data in Python, we use numpy.polynomial.polynomial.polyfit(). This function finds the polynomial coefficients that best fit the given data points using the method of least squares. Syntax numpy.polynomial.polynomial.polyfit(x, y, deg, rcond=None, full=False, w=None) Parameters x − The x-coordinates of the sample points y − The y-coordinates of the sample points deg − Degree of the fitting polynomial rcond − Relative condition number (default: len(x)*eps) full − If True, returns diagnostic information (default: False) w − Weights for data points (default: None) Return Value ...
Read MoreReturn the companion matrix of a 1-D array of polynomial coefficients in Python
To return the companion matrix of a 1-D array of polynomial coefficients, use the polynomial.polycompanion() method in Python NumPy. The companion matrix for power series cannot be made symmetric by scaling the basis, so this function differs from those for orthogonal polynomials. The method returns a companion matrix of dimensions (deg, deg) where deg is the degree of the polynomial. Syntax The syntax for creating a companion matrix is ? numpy.polynomial.polynomial.polycompanion(c) Parameters: c: A 1-D array of polynomial coefficients ordered from low to high degree Basic Example Let's create a ...
Read MoreGenerate a Pseudo-Vandermonde matrix of given degree and x, y, z complex array of points in Python
To generate a pseudo-Vandermonde matrix of given degree and sample points (x, y, z), use the polynomial.polyvander3d() function in NumPy. This method returns the pseudo-Vandermonde matrix of degrees deg and sample points (x, y, z). Syntax numpy.polynomial.polynomial.polyvander3d(x, y, z, deg) Parameters x, y, z − Arrays of point coordinates, all of the same shape. The dtypes will be converted to either float64 or complex128 depending on whether any of the elements are complex. Scalars are converted to 1-D arrays. deg − List of maximum degrees of the form [x_deg, y_deg, z_deg] ...
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