Quad is a scipy package which is used for 1D integration in Python
Questions tagged [quad]
135 questions
2
votes
5 answers
Definite integral over one variable in a function with two variables in Scipy
I am trying to calculate the definite integral of a function with multiple variables over just one variable in scipy.
This is kind of like what my code looks like-
from scipy.integrate import quad
import numpy as np
def integrand(x,y):
return…
Hannah
- 165
- 2
- 3
- 13
2
votes
2 answers
Integrating a function over a variable other than the first, looking for an alternative to lambda
Is there any other way than using a lambda function to integrate a function in python 2.7 over, say, the 2nd of two variables? For instance, I would like to integrate this example function over x:
import numpy as np
from scipy.integrate import…
Forzaa
- 1,465
- 4
- 15
- 27
1
vote
1 answer
How to compute the inner integral with quad?
I am reading the paper by Floris and try to compute the numerical value of the normalization constant C_I from eq. (20).
From the eqution
and property of transition probability density function (PDF)
, the normalization constant is:
In my case,…
Nick
- 1,086
- 7
- 21
1
vote
2 answers
Numerically evaluate triple integral with non-constant limits
Numerically evaluate triple integral with non-constant limits.
I want to numerically perform a triple integral of a two-variable functionf(x,y) where both x and y have integration limits [a+t0-t,b+t0-t] and the third integral goes over t with…
TheHunter
- 111
- 2
1
vote
1 answer
Python Scipy integrate.quad()
I'm trying to solve an integral inside a for loop where the value of the integral changes with every loop.
Ni_1D = np.array([(x/2)*(x-1), x-x**2, (x/2)*(x+1)])
Tn= [10.0, 10.0, 10.0]
Tt=[0, 0, 0]
y_coor = [0.0, 1.25, 2.5]
x_coor = [4.0, 4.0,…
Lane
- 11
- 2
1
vote
0 answers
PixiJS: Affine projection vs bilinear one
Let's say there is an arbitrary composite shape in PixiJS:
I need to project a texture onto it by some kind of a grid warp in a way, so the result would be:
I have tried to do it via PIXI.SimplePlane and it seems that default projection algorithm…
toowren
- 85
- 7
1
vote
0 answers
Unity 3D Mesh Generation with Quads to Triangles
My goal is to create a simple flat mesh with a grid of vertices. These vertices are then manipulated to create a simple terrain with some areas being raised and flat like a plateau, and these plateaus are connected to the areas below by slopes.
The…
Mad Hatter
- 85
- 9
1
vote
0 answers
How to define a function in python containing a definite integral whose free parameter is running between two fixed values?
I would like to define a python function that has three parameters: C, psi, and m but it actually internally has an integral that is running based on another variable called eta.
def func(x: np.float64, C: np.float64, psi: np.float64, m: np.float64)…
Roosha
- 89
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- 10
1
vote
1 answer
Problem using lambda expression to be integrated using quad from mpmath
I am trying to integrate an oscillatory expression with mpmath.quad. The integral only has one variable but I need to evaluate it in a 2D space. I need the resulting function from the integral along kx to be evaluated for a group of coordinated in x…
Monosgaitnas
- 27
- 4
1
vote
0 answers
Error map-functions.lua:42: bad argument #2 to 'draw' (Quad expected, got nil) , any idea what's wrong?
I'm very new to love and lua and I don't know why I keep getting this message, any ideas? here's my code, hope you guys know what I could do.
in maps-functions.lua
function loadMap(path)
love.filesystem.load(path)()
end
function newMap(tileW,…
zara b
- 11
- 1
1
vote
1 answer
How to limit number of function calls in scipy.integrate.quad?
Scipy.integrate.quad() seems to make too many function calls in come cases. Here is a simple test to demonstrate:
import numpy as np
from scipy import integrate
def intgnd(x):
p = x + x**2
return…
Marvin Germain
- 13
- 2
1
vote
1 answer
Python: Integration over Multiple Dimensions of function taking an array input
I am having difficulty computing multiple integrals of functions with taking array inputs. I would like to use scipy.integrate's nquad function because I need to be able to integrate from -np.inf to np.inf (I'm working with probability density…
John
- 35
- 7
1
vote
0 answers
ValueError: Residuals are not finite in the initial point. (Python)
I need to fit a graph using a complicated function including numerical integration.
If I do this using a simpler function (which is also an integral), this method works, but for the function I'm trying, it's not working.
Although the program is…
1
vote
1 answer
TypeError: only size-1 arrays can be converted to Python scalars when using trapz method
This is my python code
import numpy as np
from scipy.integrate import quad, trapz, simps
import math
def f(x):
return math.exp(-(x**2/2))/math.sqrt(2*math.pi)
result, error = quad(f, 0, np.inf)
print("{:f} {:g}".format(result, error))
x =…
Aswin K R
- 29
- 1
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1
vote
1 answer
Problems integrating using quadpy
I am trying to use quadpy as I want to do 2D numerical vector integration for 2D integrals. To see how fast quadpy works, I wanted to test it and compare it with scipy 1D vector integration. Thus I wrote a simple code:
import numpy as np
from scipy…
Shankar_Dutt
- 115
- 9