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how to efficiently find the indices?
|sort| is your friend: First we sort the entries of |A| so that like entries are adjacent [S, iSorted] = sort(A(:)); ...

13 years 前 | 3

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Matlab Help
"Use MATLAB to solve the following...." I've done it, now what do I get? Chocolate fish?

13 years 前 | 0

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how to efficiently find the indices?
Depending on whether you want the first or the last occurence [uM, I] = unique(M, 'first') [uM, I] = unique(M)

13 years 前 | 0

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Generation of a matrix
To give you some context, 9^275 = 2610298031214360458037978142613933577909126030175802622149530339319603934430500962487448801...

13 years 前 | 0

提问

Licensing: Parallel Computing Toolbox labs vs independent MATLAB sessions
From a licensing perspective, what's the difference between running |n| independent MATLAB sessions and running |n| Parallel Com...

13 years 前 | 2 个回答 | 0

2

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matrix automation problem
This is one annoying case where the sparse version |spdiags| can do more than the full one |diag| n = 10; m = n-2; c1...

13 years 前 | 0

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In an assignment A(I) = B, the number of elements in B and I must be the same - error using ode 45
Hi Peter Your code is actually fine (I just ran it). You must have something nasty hanging around to give that error (as Walt...

13 years 前 | 0

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Finding lists of connected triangles in TriRep class
Why don't you want to define an adjacency matrix? If you do, then you could just use the |components| routine in MATLAB-BGL <...

13 years 前 | 0

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kl transform
There's a demo in the file exchange <http://www.mathworks.com/matlabcentral/fileexchange/30678-image-compression-demo-usins-k...

13 years 前 | 0

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Is deleting threads helpful in this forum?
My opinion is that a question can be deleted until it has been answered. Then it can't. Editors, and only editors, should be abl...

13 years 前 | 2

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Ellipse implicit equation coefficients
First, if the centre is nonzero, then that form of the ellipse equation will not work. You need the more general quadratic form ...

13 years 前 | 0

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[DISCONTINUED] Wish-list for MATLAB Answer sections.
Each question on the Home page should have an icon indicating whether there has been activity on the question since you last loo...

13 years 前 | 0

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Differential equation system in Optimization Toolbox
Your problem is a linear program in the arrays x1, x2, z1, z2. Because the RHS of the ODEs is piecewise constant, the problem ca...

13 years 前 | 0

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How to index a cell with two columns?
[data(:, 1); data(end,2)]

13 years 前 | 0

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Euclidean Distance (huge number of vectors)
You could do something like this and leave it running overnight :| Obviously you'd define your histogram edges to be relevant to...

13 years 前 | 1

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Can Matlab do L1 minimization?
Assming |f| is all ones, and you're wanting to minimise the 1-norm of |x|, then your code will be doing what you wish

13 years 前 | 0

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13 years 前 | 0

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divergence results using ode45 in .m-file and using ode45 simulink
Try forcing |ode45| to use time steps no bigger than the simulink ones, i.e. opts = odeset('MaxStep', 0.1); %substitute 0....

13 years 前 | 1

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How to find a element in cell array
Can you define your cell array differently (can it be a 2D cell array, rather than a cell array of cell arrays?) If so, then ...

13 years 前 | 0

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How to replace some of the value in the matrix with NaN?
Here's a much faster method that satisfies both of your constraints. It may be possible to vectorise the loop, but it is, in my ...

13 years 前 | 0

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How would you plot, run a for loop, and a string at the same time?
change your cell format slightly colors = {'ro', 'ko', ... etc } then plot(..., colors{k}) not colors(k...

13 years 前 | 1

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Function or constraints have too few arguments on the right to satisfy the left
Your nonlinear constraints need to be in a function of the form function [c, ceq] = g(x) c = [8*75./x(5) ....... ...

13 years 前 | 0

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adding of signals
Also you can use |interp1| if you don't have the image processing toolbox

13 years 前 | 0

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Solving Systems of Linear Equations
It very much depends on your matrices. What are the dimensions? Rank? If A square and full rank then |X| is uniquely determi...

13 years 前 | 0

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solve nonlinear equations + numerical integration
Final answer: your equations have no solution t = 0.1:0.1:0.6; z = [0.0213; 0.0222]; x = [1.4334 1.46; 1.435 1.46]; ...

13 years 前 | 0

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solve nonlinear equations + numerical integration
You could pose it as an optimization problem. First set up a function that will be zero when z1,z2 are equal to their correct va...

13 years 前 | 0

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How to get the location/coordinate of a value in the matrix?
[I,J] = find(isnan(A))

13 years 前 | 0

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How to instead the "for" loop?
Un-nest your loops - your a,b and c,d loops are independent of each other. What you're doing is running your inner two loops gaz...

13 years 前 | 0

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right shift of integer variable
the C language doesn't officially specify what happens on a right shift of a negative signed integer, it's up to any given compi...

13 years 前 | 0

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right shift of integer variable
|bitshift| is for unsigned integers. What exactly do you want your signed right shift to do?

13 years 前 | 0