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Questions tagged [dot]

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869 views

Why is calling Dot with many arguments so inefficient?

Say I want to multiply a reasonably large list of symbolic matrices. ...
380 views

Why does partitioning increase Dot execution speed?

I have noticed that multiplying a list of matrices can be significantly sped up by partitioning the list, calculating the product of the partitions matrices, and then multiplying the results. ...
209 views

81 views

Dot Product of Matrices in NDSolve

How to efficiently solve a system of differential equations involving matrix dot product? The example below is solved extremely fast when the array structure is flattened out. Is there a way to reach ...
102 views

How to change node color in .dot file using pattern matching?

For example I have a dot file that describe a decision tree or binary tree In the file, the color of node is always gold, so I try to change it according the number in ...
135 views

Generalized n-fold inner product for tensors, iteration and indexing or built in functions?

I'm very new to Mathematica, and struggling to convert one of the codes I'd written in MATLAB. I am trying to program a function for a generalised inner product between two tensors, that is for ...
208 views

Dot product result has wrong dimension [closed]

I'm doing a small project and I've encountered a problem while using Mathematica. I should mention that I'm kinda new to this software, so maybe it's just something I haven't grasped yet. Anyway, I ...
165 views

Orthogonalize with a custom inner product

Bug introduced in 9.0 or earlier and fixed in 10.0 I was trying to define a custom inner product function for Orthogonalize, and have been getting some odd behaviour. Here's a MWE: I try to compute ...
188 views

Unexpected inefficiency when calculating matrix product by Dot

There is an unexpected inefficiency when I calculate matrix product by Dot. The only relevant part of my code is presented as follows: ...
934 views

Using the Norm Function

I am trying to take the norm of a general vector and show that for vectors, v,w, that Norm[v cross w]^2==Norm[v]^2*Norm[w]^2-(v dot w)^2 In Mathematica, here are my steps: ...
59 views

Importing a .dot graph file, and changing vertex label format

I worked out how (one way...) to import a .dot graph format file into Mathematica using ...
359 views

Pulling out a prefactor from a dot product

I have three complicated vectors u, v and w as well as three simple prefactors ...
475 views

dot product not working [closed]

Im supposed to take the dot product of a function and itself. The matrix is a system of 4 equations defined to be : ...
534 views

Adding dots to an empty region of space [closed]

I want to add dots to the maze so far I know only how to get one dot on the maze. I don't know if there is way without using coordinates. So it would look like this with the dots added (source: ...
38 views

How to plot two functions together when one of them needs to be a series of dots, with common labels and colors?

I have two functions that I want to plot together. I want to plot the non-linear and the linear (NL and L in my code) functions together, but I wish that the NL function is plotted as a series of dots ...
36 views

Distribute dot and multiplication on a sum

I have a simple problem, I would like to get the following: In= Distribute[a.(b+c)*d] Out= a.b*d+a.c*d Meaning that I would like the dot product and the ...