回答済み
How can i speed up this large matrix multiplications?
There is also another way to precompute B*C as explained <https://fr.mathworks.com/matlabcentral/answers/416237-how-can-i-improv...

8年弱前 | 0

| 採用済み

回答済み
I have some elliptic curve points as (x y) . How can i extract just y values of all the points ?
p = 123457; a = (0:p-1); y2 = mod(a.^2,p); z = mod(a.^3+537*a+2438,p); [b,i] = ismember(y2,intersect(z,y2)); ...

8年弱前 | 1

| 採用済み

回答済み
How to find all possible routes with a given node matrix?
I found actually 13 paths, more than the 10 you have listed: [6 1 23 9 8 7 4 2 5 11 10 13 12 14 19 18 16 17 25 22 21] ...

8年弱前 | 2

| 採用済み

回答済み
How can I speed up the following code? I am using MATLAB R2018a. Thanks.
Code blindly: PP = reshape(p,[X*Y,T]); % p == 0? EE = reshape(e,[X*Y X*Y]); MM = reshape(M,[X*Y T]); PP = PP + bet...

8年弱前 | 0

| 採用済み

回答済み
How to find area of all possible polygons?
n = 5; % No. of control points array = 1:1:n; p=arrayfun(@(k) num2cell(nchoosek(array,k),2), 3:length(array), 'unif'...

8年弱前 | 0

| 採用済み

回答済み
Newton's method for root finding
Quick look, this looks suspiciously a buggy statement xold=xold;

8年弱前 | 0

| 採用済み

回答済み
how to get summation of column-2 values by comparing column-1 values in matlab
load('att_total_count.mat') [c1,~,J] = unique(data3(:,1)); s2=accumarray(J,data3(:,2)); [c1,s2] plot(c1,s2...

8年弱前 | 0

回答済み
How to find all the possible permutations in a given array?
x = [1 ; 2 ; 3 ; 4 ; 8 ] p=arrayfun(@(k) num2cell(nchoosek(x,k),2), 3:length(x), 'unif', 0); p=cat(1,p{:}); p=c...

8年弱前 | 0

| 採用済み

回答済み
Replacing for loops for faster computations involving 3D matrix and sampling
What are xSample,... zSample and idx? Not sure you need to translate and filter over and over in the for-loop. It seems awful...

8年弱前 | 0

回答済み
Updating from 2018a to 2018b
You need to uninstall manually the version that you don't want to keep. Some people like me have many versions installed on t...

8年弱前 | 1

回答済み
is it possible that answers can be accepted?
I might win 2 points or nothing

8年弱前 | 0

回答済み
is it possible that answers can be accepted?
Can you accept this one and the previous one?

8年弱前 | 1

回答済み
is it possible that answers can be accepted?
Can you accept this one and the next one?

8年弱前 | 0

回答済み
I am trying to plot a 3D figure defined by z>=0:
x = linspace(-2,2,50); y = linspace(-2,2,50); z = linspace(-0.1,2,50); x = reshape(x,[],1,1); y = reshape(y,1,[],...

8年弱前 | 1

回答済み
Plotting the area defin
almost right, you need to make a & b oriented in 2 different dimensions (here row for a and column for b) a=linspace(0...

8年弱前 | 0

回答済み
Plotting the area defin
Or perhaps you want this? a=linspace(0,1,100)'; b=linspace(0,1,100)'; rect = [a 0+0*a; 1+0*b b; fli...

8年弱前 | 0

回答済み
What does 'Mex file (mexw64) cannot find required compilers' mean?
It means you need a C-compiler installed on your computer

8年弱前 | 0

回答済み
Ensure same random coordinates do not appear twice
You can do by rejection margin = 1.2; n = 1000; xy = []; mxy = 0; while mxy < n m = ceil(margin*n)-mxy; ...

8年弱前 | 0

回答済み
How to get all the solutions to an underdetermined system of linear equations using lsqnonneg()?
The number of solutions is infinity. Explanation: >> size(a) ans = 5 45 In your case you have ...

8年弱前 | 4

| 採用済み

回答済み
Cubic Splines for Interpolation
% fake data x = sort(rand(1,5)) y = rand(size(x)) xmissing = linspace(0,1,1000); % put here coordinates of pts to...

8年弱前 | 0

回答済み
How to group double matrix based on the first column values and list second values as observations?
X = [1 2.1 1 2.3 2 1.9 3 4.0 1 2.0] [id,~,j]=unique(X(:,1)); val = accumarray(j,X(:,2),[],...

8年弱前 | 1

| 採用済み

回答済み
Count number of times value occurs
Assume a and b are row vectors, and one of them is not too big c = sum(a(:)==b,1)

8年弱前 | 0

回答済み
Count number of times value occurs
Method for large _a_ and _b_ [u,~,j] = unique(b(:)); [b, i] = ismember(a(:),u); c = accumarray(i(b),1,size(u)); c ...

8年弱前 | 3

| 採用済み

回答済み
Obtain subscript values of common diagonal rectangle in binary matrix?
% Fake data MM_bin=rand(100)>0.2; check_mat = [0 0 0 0 0 1 1 1 1; 0 0 0 0 1 1 1 1 0; 0...

8年弱前 | 0

| 採用済み

回答済み
Matrix showing all combinations of multiple dice roll
dice_size=[2 3 4]; n = length(dice_size); c = arrayfun(@(n) 1:n, flip(dice_size), 'unif', 0); [c{:}] = ndgrid(c{:...

8年弱前 | 2

| 採用済み

回答済み
How get row index of first and last appearance each unique cell element
Make the output in the "stable" order: x = ["MUY09KT00" "TW00.00" "MUY09KT00" "TW00.00" "MUY09KT00" "TW00.0...

8年弱前 | 1

| 採用済み

回答済み
reduce execution time in matlab
@dpb The comment %#ok<AGROW> tells the author (Kevin Sheppard) is well aware about growing, and he obviously doesn't care. ...

8年弱前 | 0

回答済み
What is the complexity of ismember function?
"Is there a better function in matlab (with lower complexity) that i can use that assuming the input is sorted" You could do ...

8年弱前 | 0

回答済み
What is the algorithm used by svds function?
svds is a MATFILE and it calls different methods depending on your inputs. You might step over and see if _matlab.internal.math....

8年弱前 | 0

| 採用済み

回答済み
assimble small victors into bigger one using for loop
a1= [1; -1]; a2= [1 ;-1]; a = {a1 a2}; F = zeros(length(a)+1,1); for i=1:2 F(i+[0,1]) = F(i+[0,1]) + a{i}...

8年弱前 | 0