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John Doe


Actif depuis 2013

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Golf Recamán's sequence
Recamán's sequence described in pseudo-code is as follows: A(0) = 0 A(n) = A(n-1) - n if A(n-1) - n > 0 and is new, else...

plus de 9 ans il y a | 1 réponse | 0

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Question


Can I find out in which release a function was introduced?
Sometimes I get error messages saying stuff like: Undefined function 'savefig' for input arguments of type 'char' or ...

presque 10 ans il y a | 2 réponses | 1

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Question


x = 0:0.1:10... What's going on, really?
Please have a look at the following example: A = 0:0.1:0.4; find(A == 0.3) ans = Empty matrix: 1-by-0 fi...

presque 10 ans il y a | 3 réponses | 2

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A répondu
Finding integers between two vectors
A= [4.54 5.11 9.58 15.04]; B= [1.01 3.2 5.5 16.98]; C = sort([A; B]); C(1,:) = ceil(C(1,:)); C(2,:) = floor(C(...

plus de 10 ans il y a | 0

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Question


Using bsxfun for non-numeric data
Is there an equivalent to bsxfun for non-numeric data? For example, I want to compare all pairs of strings stored in two cell...

presque 11 ans il y a | 3 réponses | 3

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Question


Find row number of elements
Hi, I have a list of branches, |BL|, and a list of nodes, |nodeList|. BL has two columns, containing to-from nodes for each b...

presque 11 ans il y a | 1 réponse | 0

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join two matrices together
C = reshape([A; B],177,8) Good luck! - Rob

presque 11 ans il y a | 1

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A répondu
what is the meaning of BW = ~ BW?
It gives you back the inverted binary matrix BW. That means, all 1's turns to 0's, and vice versa. In plain text: BW = not...

presque 11 ans il y a | 1

A répondu
multiplication table in matlab
Another one-liner: cumsum(meshgrid(1:10))

presque 11 ans il y a | 4

Question


Format axes in plot
Is it possible to color a single number (or a set of numbers) on one of the axes in Matlab? Suppose I have a plot: plot(...

presque 11 ans il y a | 1 réponse | 0

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Question


Legend in biograph plot
I have a |biograph| object, and I want to "color-code" the edges and vertices. Is it possible to get legends in the biograph...

presque 11 ans il y a | 1 réponse | 1

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A répondu
Mean of 2 arrays
One way would be: mean(mean([imag{1} imag{2}])) If the dimensions don't match: mean([imag{1}(:); imag{2}(:)])

presque 11 ans il y a | 1

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Adding two different size matrices
You can't add matrices of different dimensions. The transpose of A has dimension (50x100) Think of it: A = [1 2 ...

presque 11 ans il y a | 0

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Question


Speed up sparse matrix calculations
Is it possible to speed up large sparse matrix calculations by e.g. placing parantheses optimally? What I'm asking is: Can I ...

presque 11 ans il y a | 1 réponse | 0

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A répondu
Explanation of the code
The input to |cosd| and |sind| are in degrees, whereas it is in radians for |cos| and |sin|. l = sind(alpha)*b; % the verti...

presque 11 ans il y a | 1

Question


Profiling for cells instead of functions
I have a function that in turn calls many more functions. I want to use the profiler to identify what parts of the code is most ...

presque 11 ans il y a | 1 réponse | 1

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Question


Finding the difference between columns in matrix without loops
I have the results from an iterative process, where the results from each iteration is placed beside eachother, like this: ...

presque 11 ans il y a | 1 réponse | 0

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A répondu
Not enough input arguments
Use lower case m, or some other letter that can't be mixed with upper case M, as indices in your for-loops, and you'll get there...

presque 11 ans il y a | 0

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Please tell me what's wrong here with the exp (1j*theta)
The reason is that: 5 rad = -1.2832 rad % (-1.2832 + 2*pi = 5) That is: x = x + n*2*pi; % where x is an angle in...

presque 11 ans il y a | 0

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A répondu
Not enough input arguments
How do you call this function? You need input arguments when running it (you can't press F5 or something similar). You co...

presque 11 ans il y a | 0

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Help with Basic 2D Contour Plot
Follow the instructions from Friedrich, but flip the matrix around before you plot it. Now, Z(1,1) is in the origin, Z(1,2)...

presque 11 ans il y a | 0

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Help with Basic 2D Contour Plot
Will this work for you? q = zeros(4); for s=[0:1:3], for t=[0:1:3], q(t+1,s+1)=triarea(s,t) end...

presque 11 ans il y a | 0

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how can I create a vector with unknown length?
The most intuitive (and simple to implement) is probably bubble sort: <https://en.wikipedia.org/wiki/Bubble_sort> Since th...

presque 11 ans il y a | 1

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How to shift the origin or how to make median of the data to be origin or zero?
Do you just want to substract the median value? In that case: cc = aa-median(aa); Now the median of cc = 0. Hope it h...

presque 11 ans il y a | 0

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matrix manipulation and components
Is this what you're asking for? A(A>3.1) - Rob

presque 11 ans il y a | 2

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A répondu
How create serial RLC circuit in Simulink?
It looks as though your intial conditions are 0 for both integrators. Are you supposed to simulate the system in steady-stat...

presque 11 ans il y a | 0

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traversing a long matrix
I think this should work ind = find(A(:,1) == A(:,2)); - Rob

presque 11 ans il y a | 0

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Question


Strange results from tic / toc.
I'm checking the running time of a function using tic/toc. I write the following in the command window (and execute it simultane...

presque 11 ans il y a | 1 réponse | 1

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A répondu
Filling vector with a condition.
Like this? A = [1 2 -3 0 4 0 -5 0 6]; B = 10:19; C = zeros(1,length(A)); C(A>0) = B(A>0) C = ...

presque 11 ans il y a | 2

A répondu
I can correct the error. Help me please!!
This should work: [X,Y] = meshgrid(x,y); f = sin(power(X,2)-power(Y,2)) Hope it helps =)

presque 11 ans il y a | 0

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