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If I select an element in a matrix, say MAT(2,2), how to find how many elements of the same value of MAT(2,2) in the matrix are "connected" to it.
You need bwconncomp <https://it.mathworks.com/help/images/ref/bwconncomp.html> For example: Mat=[1 2 3 4 2;2 2 2 2 0;...

8 years ago | 2

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how to change or compliment a particular bit in the binary string?
Here it is a=50; b=dec2bin(a) pos = 4; b(pos) = char(97-double(b(pos)))

8 years ago | 1

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string to number conversion with mixed values
str1 = 'index_N=10' str2 = 'index_M=5' sub1 = str1(7:end) sub2 = str(7:end)

8 years ago | 0

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How do i adjust the spacing between the slices of my stacked images?
First, most probably you don't want to stack them in the 4-th dimension as you wrote rgb4D = cat(4, IA, IB, IC, ID); Bec...

8 years ago | 0

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3D grouped bar graph
I think the only way is to group data into one matrix (bar2 groups data row-wise) figure(1) bar3([y1,y2],'grouped')

8 years ago | 0

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Randomly scramble letters in a single word
No need of while. If you want to permute word letters with forced use of a loop, extract one-by-one the letters from word withou...

8 years ago | 1

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How to find unique elements in a vector without using unique or find?
Use an histogram based approach (works only for positive integers) %get M random numbers from 1 to N M=10; N=25; ...

8 years ago | 0

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Answered
How to mirror matrix on the diagonal?
In the case described before it is: A=[1 2 3;4 5 6;7 8 9] rot90(A,2)' which gives: A= 1 2 3 4 5 6 ...

8 years ago | 4

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Can waitforbuttonpress function be used with switch cases..?
Output of waitfrobuttonpress is not a string, is number: for i=1:10 keydown = waitforbuttonpress; switch k...

8 years ago | 1

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Answered
How to load a .dat file?
<https://it.mathworks.com/matlabcentral/answers/79885-reading-dat-files-into-matlab>

8 years ago | 0

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How can I write both number and text to a file?
Look here: <https://it.mathworks.com/help/matlab/ref/fprintf.html> Here it is: x = 'BEGIN 0.00 0,0 0.5,1 1,1.5 1.5,1....

8 years ago | 0

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Find entire rows in a matrix where a column value meets a certain condition
Assume your 50000x4 matrix is A, this will remove all the rows such having 4th element = 101300: A(A(:,4)~=101300,:)=[];

8 years ago | 0

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How to I overlap two images?
Here it is img = zeros(256,256); img(:, [1:6:end, 2:6:end, 3:6:end]) = 1; imshow(img), axis on; %build RGB image...

8 years ago | 1

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Answered
Creating a matrix with binomial distribution in elements.
Check for "binornd" function in Matlab docs

8 years ago | 0

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Convert 3D matrix to 2D matrix.
I try to guess from your question: %random 3D array A=rand(5,6,7); %extract a 2D matrix from first dimension of A ...

8 years ago | 0

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Answered
Sort 3d matrix according to another 3d matrix
According to Walter's comment, the previous solution was wrong. Here is a way to sort B given the sorted A along the 3-rd dimens...

8 years ago | 0

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Exporting Figures in matlab
I don't think export_fig allows you to set height and width. But, consider using -m<val> - option where val indicates the ...

8 years ago | 0

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Can someone explain why I'm getting 0 as answer for the following integral?
This is a case where quadrature formulas fail.. Indeed, by computing the (very simple) integral manually, one gets integ_...

8 years ago | 0

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Error when running certain function
Type the command ver in the command line, and check in the list if Financial Toolbox is there. If not, you need to inst...

8 years ago | 0

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Graphs Not Showing Up
You just see the last two ('3' and '4') because the values are the same, so curve are superimposed and you just see the last one...

8 years ago | 0

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How to reshape an matrix made from an input turned into a double value?
Your code only works for 4-characters long strings because you are reshaping them to 2x2 matrix.

8 years ago | 0

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How to plot the relationship between two unknown values as those values change?
For every Y~=T, the equation above is true for X=WZ/(Y-T)...

8 years ago | 0

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Answered
random data generation using mean and identity matrix
Just transpose the solution: MU=zeros(1,10); SIGMA=eye(10); xTrain = mvnrnd(MU,SIGMA,1000)';

8 years ago | 0

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Answered
Compute a new vector dependent on two others and a random probability
By doing x==0.2 | y==0.2 you are testing that ALL theelements of x or y equal 0.2. Is that really what you want?

8 years ago | 0

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What is the logic behind fzero and fsolve which make fsolve's speed faster than fzero?
The functions fsolve and fzero are not meant to solve the same problem. Specifically: # fzero: It finds the root of a functio...

8 years ago | 6

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questions about solving a linear equations ( \ vs pinv vs least-square)
Your matrix X has full rank, so the difference between the two methods shouldn't be so high. Running it on my pc I indeed obtain...

8 years ago | 0

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How to plot semilog y graphic in Matlab?
The matlab function semilogy() is what you need: <https://it.mathworks.com/help/matlab/ref/semilogy.html?searchHighlight=semi...

8 years ago | 2

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Answered
sort X and Y columns according to a repeated string in a 3rd column and scatter plot
Get the "subject" column in one array containing data of all people, as follows: allsubjects = data(:).subject

8 years ago | 0

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[V,D]=eig(S1,S2) ?
They are not captured by the syntax of eig(A,B). Let me explain you why: The call [V,D] = eig(A,B) returns diagonal ...

8 years ago | 0

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a matlab code of getting a value uniformly at random from a the set {-1,1}
If you look for a real number in the interval [-1,1], here is it n = 2*rand-1 If you look for an integer either 1 or -1,...

8 years ago | 2