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**Feeds**

How to sum n lines of a matrix to another matrix?

n=2; TotalApit = reshape(sum(reshape(Apit,[n 102/n 5 1000])),[102/n 5 1000]);

5 years ago | 0

Determining the max angle from the cell array

This should do. Change |ncells| as desired. ncells = length(Ang_F1); max_edges_anglesR = max(angle(reshape(cell2mat(Ang...

6 years ago | 0

| accepted

what is the MATLAB function to evaluate ncr value when n is real

If |n| and |r| are both non-negative integers, and |n >= r|, use: nCr = nchoosek(n,r) If n and/or r can be negative, yo...

6 years ago | 2

| accepted

Multiplying two matrices of probabilities with different sizes.

I don't think there is anything wrong with your code. What is wrong is your interpretation of the outcome of multiplying your ma...

6 years ago | 0

Plot trajectory colorized according to the standard deviation

Plot your data as a |surface| with zero height. x = vector_of_latitudes; y = vector_of_longitudes; z = zeros(size(...

6 years ago | 0

picking maximum difference across entries of row vectors, Part 3

A = [NaN NaN 3 9 4 ; 1 100 NaN 34 12]; maxdiffs = max(sort(A,2),[],2) - min(sort(A,2),[],2);

6 years ago | 0

| accepted

Extract structure array elements into seperate matrix

No, that syntax won't work. If you want a one-liner, here's one alternative: extracted = cellfun(@(x) x(1,2), {data.datablo...

6 years ago | 0

| accepted

How can I find columns with all zeros in my matrix?

cols_with_all_zeros = find(all(A==0)); % all zeros cols_with_3_nonzeros = find(sum(A~=0)==3); % exactly 3 non-zeros

6 years ago | 3

| accepted

Finding the first element of a 1-D array that yields a negative result.

x = normrnd(0,1,[1,20]); % generate 20 random numbers y = x(find(x<0,1)); % assign the first negative random value to y

6 years ago | 0

How to multiply matrices using a for loop

p = rand(4,1); % 4x1 vector P = rand(4,4); % 4x4 matrix pstar = 10; while p(1)<pstar % stop multiplying if p(1) reach...

6 years ago | 0

Find unique in matrix of x,y coordinates

Did you try this? [C,IA] = unique(A,'rows'); |C| contains all unique rows of |A|. |IA| contains the indices of the rows...

6 years ago | 0

How do I create a for loop for the this example?

You can use |eval|. Something like this should work, although you need to take care of saving your variables at the end of each ...

6 years ago | 0

| accepted

How to sample Multinomial Distribution

It is difficult to read your question. Please use underscore to separate your variable names from subscripts. Here's a solution ...

6 years ago | 1

| accepted

How to plot 3d line on fit function?

You need to use |hold on|. For example, x = rand(100,1); y = rand(100,1); z = x.^2 + y; sf = fit([x, y],z,'poly...

6 years ago | 0

| accepted

Element by Element Subtraction

|minus| operator in Matlab can inherently handle this, so you don't need a loop. Checkout >> |help minus|. For your case, some...

6 years ago | 0

how to change Function value intiialization? mine is start with 0. i want start with -1

f = zeros(1,length(t)) - 1;

6 years ago | 0

Edit/deleted the question

You need to read this article on indexing: <https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.htm...

6 years ago | 0

quadprog 'trust-region-reflective' algorithm error

As you said, _the only limit to the use of this algorithm is that only equality constraints or bound constraints can be used but...

6 years ago | 1

Sorting from the maximum value to minimum value in a vector

A=[2 5 8 7 8 9 3 7 6 5 4 1]; Asorted = sort(A,'descend'); % sorted from max to min [~,indx] = unique(Asorted); equalp...

6 years ago | 1

| accepted

Setting similar scale for two graphs

You need to use |plot(x,y)| instead of |plot(y)|, where |x| is the vector of x-values at which you want to plot |y|. For example...

6 years ago | 0

ANOVAN with possibility of matrix as an input (columns as the variables)

The complex syntax of |anovan| allows you to handle the case of unbalanced data. Since you have the same number of observations ...

6 years ago | 0

| accepted

One-tailed test using the ranksum function

Your premise that "we should always get h=0, irrespective of the value of ‘alpha’" is not correct. Please see the definition of...

6 years ago | 0

Plot det(matrixA - (x * eye(3))) where x = 0:3

You want to do this for each value of |x|, so |x| must be treated as a scalar, not as a vector. A = rand(3); % do for some ...

6 years ago | 0

| accepted

Why am I getting such a large number on the initial iteration?

The problem is that you are overwriting the variable |n| inside the loop, so it changes value from |100| to |10|. Changes: ...

6 years ago | 0

row of all 8’s

N = 10; X = ones(N); % create a matrix of 1s X = [X(1:N-3,:) ; 8*ones(1,N) ; X(N-2:end,:)]; % add a row of 8s between (N...

6 years ago | 0

| accepted

working out acceleration from 2 matrices- HELP

It is not correct to put a |0| when you don't know the value of acceleration. Instead, you should define a new vector of time po...

6 years ago | 0

How can I make an array of handles?

You don't need an array of handles to do that. You can use arrayfun like this: x = 1:5; y = 5; z = arrayfun(@(x,y) 3*...

6 years ago | 0

Adding noise to EEG dataset

I assume you're getting an error in this line: X = dataset + 2*randn(size(t)); because |dataset| is an |N x 2| array, wh...

6 years ago | 0

| accepted

Multiplying part of vector with another vector repeatedly without for loop

Try using |repmat|: s = sequence(:).*repmat(carrier(:),N,1); % N is the no.of 10-element segments in 'sequence'

6 years ago | 0

| accepted

How can I deal with missing data ?

What kind of calculations are you doing? For basic operations such as |sum|, |mean|, |std|, |max|, |median| etc., you can use...

6 years ago | 0