Tags down


Python SymPy Block Matrix TypeError

By : Mr. X
Date : August 01 2020, 08:00 PM
hop of those help? I am using the following code, but it's producing a TypeError (Data type not understood) for the last line (block matrix Z). I am new to SymPy. Could someone please point out my mistake? , The argument should be a list of lists:
code :
Z = sp.BlockMatrix([[i.T*i, i.T*X], [X.T*i, X.T*X]])

⎡[3]   [6  6  6]  ⎤
⎢                 ⎥
⎢⎡6⎤  ⎡14  14  14⎤⎥
⎢⎢ ⎥  ⎢          ⎥⎥
⎢⎢6⎥  ⎢14  14  14⎥⎥
⎢⎢ ⎥  ⎢          ⎥⎥
⎣⎣6⎦  ⎣14  14  14⎦⎦

Share : facebook icon twitter icon

In python sympy, how do I apply an external python funtion to each element of the sympy matrix?

By : mygodccl
Date : March 29 2020, 07:55 AM
hop of those help? To be more specific, I want to apply the following sigmoid function:
code :
>>> M.applyfunc(sigmoid)

[1/(exp(-1) + 1), 1/(exp(-3) + 1)],
[1/(exp(-2) + 1), 1/(exp(-4) + 1)]])
class sigmoid(Function):
>>> M.applyfunc(sigmoid)
[sigmoid(1), sigmoid(3)],
[sigmoid(2), sigmoid(4)]])

sympy nsolve typeError with Matrix starting vector

By : user1507283
Date : March 29 2020, 07:55 AM
it helps some times The workaround you have is necessary, given the following:
nsolve passes the x0 argument directly to mpmath.findroot, on this line findroot only supports iterables in x0 that satisfy isinstance(x0, (list, tuple)), on this line. Moreover it has to be a flat tuple or list; its elements are assumed to be scalars in the subsequent x0 = [ctx.convert(x) for x in x0].

Can sympy simplify block matrix expressions?

By : user1655866
Date : March 29 2020, 07:55 AM
Any of those help Yes, using the function block_collapse which evaluates block-matrix expressions down to the level of blocks.
code :

Access different blocks (submatrices) of a symbolic block matrix in SymPy

By : user1733969
Date : March 29 2020, 07:55 AM
seems to work fine The (i, j) block of a block matrix C is accessed with C.blocks[i, j]. An example:
code :
from sympy import *
b = Matrix([1, 2, 4, 8])
C = BlockMatrix([[b, 3*b], [5*b, 7*b]])
print(C.blocks[0, 1])

creating a block band diagonal matrix in sympy

By : Bas Wesselink
Date : March 29 2020, 07:55 AM
it helps some times I would like to create a block band diagonal matrix using sympy. Basically, the matrix should look like , The recently added banded might be a solution for you:
code :
>>> size=3
>>> var('d n r')
(d, n, r)
>>> banded(size,{0:d,1:n,-1:r})
[d, n, 0],
[r, d, n],
[0, r, d]])
>>> banded(2*size, {0:D,2:N,-2:R})
[      a, b - I*c,       e,     I*f,       0,       0],
[b + I*c,       d,       g,    -I*h,       0,       0],
[      e,       g,       a, b - I*c,       e,     I*f],
[   -I*f,     I*h, b + I*c,       d,       g,    -I*h],
[      0,       0,       e,       g,       a, b - I*c],
[      0,       0,    -I*f,     I*h, b + I*c,       d]])
Related Posts Related Posts :
  • How can I assign varaibles to json response?
  • name 'df' is not defined in box plot
  • Comparing dataframe columns
  • Can I Override Global Authentication for a Single Request Type in an ApiView using DRF?
  • Celery chain performances
  • Why am I getting "asynchronous comprehension outside of an asynchronous function"?
  • Creating a file from a docker container
  • doing too many write operations in django rest framework and postgres
  • How to change the order of bar charts in Python?
  • Pandas Data Frame manipulation
  • an undefined error in a simple python code- KeyError: '284882215'
  • Pandas split column in several columns throug string replacement or regex
  • how value is passed from __init__ method in pyhton as it dose not return anyhting
  • Dynamically inherit all Python magic methods from an instance attribute
  • Asking user to input certain information
  • how to test a deep learning model in a new dataset
  • Is np.fft.fft working properly? I am getting very large frequency values
  • How can you delete similar characters at the same positions in 2 strings
  • Does insert (at the end of a list) have O(1) time complexity?
  • Automatically Creating List of Dictionaries Based Upon Two Lists of Equal Length with Python
  • Discrete Cosine Transform (DCT) Coefficient Distribution
  • multiprocessing.Pool not running on last element of iterable
  • Python: sorting string non lexicographically
  • Render images from media directory Django
  • Cannot understand why more vectorization is slower than less vectorization in this case?
  • Django - Use a property as a foreign key
  • creating a function that loops if you do not enter the correct variables
  • Confused on how to store 3D matrices in HDF5 file in matlab?
  • TOTP: Can someone use the same otp within 30s and misuse it
  • is it possible to have 2 type hints for 1 parameter in Python?
  • Can someone explain what this Numpy array property is called?
  • Better way to add the result of apply (multiple outputs) to an existing DataFrame with column names
  • Selecting choice numbers
  • Create variables from list PYTHON
  • This code takes forever to run but doesn't give an error
  • "return" and "return None" behavior difference in generator
  • AttributeError: 'str' object has no attribute 'fbind' error using kivy in Python
  • Python not importing files when not inside conda environment
  • Is it possible to override a class' __call__ method?
  • Python library for live coordinated plotting in map
  • Pandas: counting consecutive rows with condition
  • How to define that a return type of method is an implementation of superclass
  • How can I print to the Visual Studio Code console in Portuguese?
  • Google Appengine Standard Python 2.7: Can't run Google Endpoints on localhost dev_appserver.py anymore
  • google appengine Unauthorized status 401
  • Don't understand cause of this IndentationError in my tic tac toe script
  • How to read in key-value pair from a json file as a pandas dataframe?
  • Can decorator decorate a recursive function?
  • How do I create a nested for loop where I have control of the initial loop index value
  • Unexpected error when creating a SQLite database using python
  • Pythonic way to write cascading of loops and if statements?
  • Python Beginner - Having trouble with multiple choice quiz program
  • Itertools return value NOT used in combinations
  • Return a list of words that contain a letter
  • From rows to columns using Peewee ORM
  • Parse large text document, to keep only "account number", and a specific keyword ("Market Value")
  • Cannot append to my list without getting a nonetype object error
  • Python Train Test Split
  • Optimizing following Python List of Dictionary operation with better solution
  • In Pandas merge colum1 value with colum2, both col data type is object and only few values are null in first column?
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org