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# JESUS DAVID ARIZA ROYETH

198 total contributions since 2015

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Answered
n! permutation matrices
identity=eye(4); total=perms(1:4); for k=1:24 matrixperm=identity(total(k,:),:) end

1 month ago | 0

Answered
matrix of matrices - matrix with matrices inside it
use cell array: A = {[1 2 3 4] [5 6 7 8]} A{1}% get matrix 1 A{2}% get matrix 2

1 month ago | 0

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How to compare between two cell array?
answer=cell2mat(cellfun(@(x) any(cellfun(@(y) isequal(x,y),W)),F,'uni',false))

1 month ago | 0

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Answered
Using the Mod Function to Turn a Vector (i.e. 1:15) into [1, 2, 3, 1, 2, 3, 1, 2, 3] etc.
n=3; k=[n 1:n-1]; answer=k(mod(1:15,n)+1)

1 month ago | 0

Answered
How do i determine the pixel coordinates of an image using RGB values?
image=imread('peppers.png'); R=image(:,:,1);%red chanel [x,y]=find(and(R>=230,R<=250));%here coordinates

1 month ago | 0

Answered
Listing elements from one matrix to another
A = [0 0 0 2 1 0 0 0 0; 1 2 0 0 0 0 3 2 0; 0 0 0 2 3 1 0 0 0]; B=reshape(A',3,[])'; B(sum(B,2)==0,:)=[]

1 month ago | 1

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Find missing elements of a vector
vector =1:1:80; numbers=[ 1 3 5 12 34 44 55 62 63 68 69 70 72 75 79]; another = setdiff(vector,numbers)

1 month ago | 1

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Answered
location of the i'th element
you can use nested loops for i = 1 : size(A,1) for j=1:size(A,2) A(i,j) end end with a loop: n = numel(A);...

1 month ago | 0

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Answered
real time video processing
I did real-time processing with a video, what you can do is take out the frames per second of the video and with a "tic toc" to ...

1 month ago | 0

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The size of the indicated variable or array appears to be changing with each loop iteration
P=zeros(1,n+1); P(1) = P_in; for i = 2:n CR = (P_out/P_in)^(1/(i+1)); P(i) = CR*P(i-1); P(i+1) = CR*P(i); end ...

1 month ago | 0

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Answered
Computation's with large numbers.
n=sym('94315998522576010519588224930693232398146802027362761139521'); answer=vpa((n-1)/2^143)

1 month ago | 0

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Answered
how to randomize a vector as fast as possible
I recommend using a MEX file https://ww2.mathworks.cn/matlabcentral/fileexchange/27076-shuffle?s_tid=FX_rc3_behav if you want t...

1 month ago | 0

Answered
How i check cell in cell array is different of 0?
an example: T1={{0} {4} {5} {6} {5}} items=vertcat(T1{cellfun(@(x) ~isequal(x,{0}),T1)}); items=[items{:}];

1 month ago | 0

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Answered
For Loop involving n-substitution and creating it as a row vector
n=input('the number of column for row vector= '); for i=1:n b(i)=input(['b',num2str(i),'= ']); end disp(b); y=input('i...

1 month ago | 1

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Answered
Function: Compare each Element of 2 Matrix for zero and non-zero
Z = [1,0,1;1,1,1;1,0,1] Z_2 = [2,0,2;3,1,3;2,0,2] answer=sum(sum(Z_2(Z==0)))==0;%1 if it is true

1 month ago | 0

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Answered
Indices on the left side are not compatible with the size of the right side
the problem is because you do not need to use the loop for: %begin with specifying constants AB=0.6; BC=0.1; BG=0.08; AG=A...

1 month ago | 0

Answered
I want the code to repeat for 10,000 times and add the new value to the matrix but I don't know how? Please help.
nsims = 10000; people = repmat(100,1,100); simsize = numel(people); for k = 1:nsims y = randperm(simsize, 2); ...

1 month ago | 0

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Answered
How to force reshape for change elements?
m=input('z= '); n=m+1; x=zeros(n,1); for i=1:n x(i)=input(['x',num2str(i),'= ']); end x=repmat(x,1,n).^repmat((0:1:m),...

1 month ago | 1

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Answered
'Store the first N (user enters N) Fibonacci numbers in a row vector.'I know how to get user entered number of fibbonachi numbers. But I don't know how to show them in a row vector.
clc N=input('Enter the number = '); B=zeros(1,N); B(1)=0; B(2)=1; count=1; for i=3:N B(1,i)=B(i-2)+B(i-1); end d...

1 month ago | 1

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Answered
Checking if two matrices are similar
you can check with a tolerance: tol=0.0001;%tolerance if sqrt(sum(sum((B-S*A/inv(S)).^2)))<=tol disp('It is true') else...

1 month ago | 0

Answered
how can I create a function with multiple variables?
y=@(a,x,z) a(1) + (a(2)./z) + (a(3).*x) + (a(4).*x.^2) + ((a(5).*x)./z) + ((a(6).*x.^2)./z); x=[0.1 0.2 0.3 0.4 0.5 0.6 0.65 0...

1 month ago | 0

Answered
How to Ignore the last line from a file read
s=readmatrix(filename); s(any(isnan(s),2),:)=[]; figure plot3(s(:,1),s(:,2),s(:,3),'*-r')

1 month ago | 0

Answered
How can you extract odd and even rows and columns from image to seperate image outputs
B=A(2:2:size(A,1),2:2:size(A,2),:);%Even Pixels Only C=A(1:2:size(A,1),1:2:size(A,2),:);%Odd Pixels Only

1 month ago | 0

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Answered
gpuArray for vpa (variable precision arithmetic)
In this case you are going to have to sacrifice something, if you use VPA the matrices become symbolic, therefore all the operat...

1 month ago | 0

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Answered
Create an RGB Image using a loop by choosing a random color for each pixel
no te sirve así? for i=1:10 imagen=uint8(randi(255,10,10,3)); figure imshow(imagen) end

1 month ago | 0

Answered
inserting vectors into another new vector
A=[7 17 27 35]; B=[13 22 30 15]; N = max(numel(A),numel(B)); C=[A nan(1,N-numel(A)); B nan(1,N-numel(B))]; C(isnan(C))=[] C...

1 month ago | 1

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Answered
How do I plot one 3D vector arrow for all points in a 3d scatter
% creating 3d scatter plot % Load data T = table((rand(100,3))); T = [table(T.Var1(:,1),'VariableNames',{'A'}),table(T.Var1(...

1 month ago | 0

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Represent the result of matrices manipulation as rational numbers
format rat A = [ 1/2 1/3 ; 4 5/6] B = [ 2 1/4 ; 4 1 ] C = A+B

1 month ago | 0

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Answered
How would I only save variables in a list to a matlab no recursively?
n=5;%signal1 .... signal5 signallist=split(num2str(1:n,'signal%i ')); filename='here.mat'; save(filename,signallist{:})

1 month ago | 0

Answered
Help with creating a different type of pareto chart?
Y=[ 81 15 21 38 38 21 31 27 22 135 55 24 54 66 97 11 117 332 140 34 456 4...

1 month ago | 1

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