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John Doe


Active since 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...

10 years ago | 1 answer | 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 ...

10 years ago | 2 answers | 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...

10 years ago | 2 answers | 2

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Answered
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(...

11 years ago | 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...

11 years ago | 3 answers | 3

3

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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...

11 years ago | 1 answer | 0

1

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

11 years ago | 1

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Answered
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...

11 years ago | 1

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

11 years ago | 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(...

11 years ago | 1 answer | 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...

11 years ago | 0 answers | 1

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Answered
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}(:)])

11 years ago | 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 ...

11 years ago | 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 ...

11 years ago | 0 answers | 0

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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...

11 years ago | 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 ...

11 years ago | 1 answer | 1

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answer

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: ...

11 years ago | 1 answer | 0

1

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Answered
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...

11 years ago | 0

Answered
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...

11 years ago | 0

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Answered
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...

11 years ago | 0

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Answered
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)...

11 years ago | 0

Answered
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...

11 years ago | 0

Answered
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...

11 years ago | 1

Answered
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...

11 years ago | 0

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

11 years ago | 2

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Answered
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...

11 years ago | 0

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

11 years ago | 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...

11 years ago | 1 answer | 1

1

answer

Answered
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 = ...

11 years ago | 2

Answered
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 =)

11 years ago | 0

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