Bruno Luong

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1,556 total contributions since 2009

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Answered
Vectorizing issue in MATLAB
It is in general not possible to vectorize sequential calculation like yours.

18 hours ago | 0

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Answered
How to find out a smallest sub-matrix B from a sparse matrix A which has the equal rank and # of non-zero columns?
Done, B=A (so all rows of A) meets your requirement >> A = [ 1 -1 0 0 0 0 0 0 0 1 ...

1 day ago | 0

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Converting a 3D Matrix to multiple 2D matrices
Assuming A is array 1000 x 1000 x 40 C = num2cell(A,[1 2]);

5 days ago | 1

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Multiply all pages of a matrix
AFAIK there is no alternative way in general; unless your matrices has special property that can use some simplification.

7 days ago | 0

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Using addpath on Compiled Code
I can't see addpath in your snip of code. When you compile the app, all the source mfiles used by you app MUST be found by depe...

7 days ago | 0

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Matlab interpolation between two surfaces
Assuming your two original surfaces are z1 and z2, juts pick w scalar in (0,1) interval, zinterp = (1-w)*z1 + w*z2; If w == 0 ...

7 days ago | 0

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Matlab executable not running on remote access files
"I would like to change the directories for reading and writing theses files." IIRC the cd command is non effective in deployed...

7 days ago | 0

Question

Answers editor seems to be broken
I can't see the editor tool in some PC display config + Firefox After a simple view of the thread it ask me as if I would edit ...

8 days ago | 1 answer | 0

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answer

Question

Is FORMAT DEBUG still any useful?
Can someone has an explanation for this (R2020B) clear clc x=1; y=x; x=x+1; format debug y x that produces y = ...

9 days ago | 1 answer | 1

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answer

Answered
Two linear equation with absolute value equation
Correct minimum norm solution is xmin = 90.0000 -40.0000 5.0000 5.0000 normxmin = 98.7421 obtain...

9 days ago | 1

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Answered
Rearranging a 512x64 matrix into a 32x1024 matrix
% Assuming A is your input matrix of size 512 x 64 % such as % A=reshape(1:512*64,64,512)'; B = reshape(permute(reshape(A,[...

9 days ago | 1

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Answered
generate random number with total sum is 10
For the case of more generic sum of n variables Xi is equal to 1. If the apriori distribution is supposed to be uniform density...

9 days ago | 1

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Is fmincon appropriate for optimizing vector-valued optimization variables (scalar obj. function)?
Yes fmincon supposes to handle optimization problems on objective function that depends on vector of real values. There is no re...

10 days ago | 0

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How do I map array values on a logical array
Result = zeros(size(B)); Result(B==1)=A

10 days ago | 1

Answered
Find the line where 2 planes intersect
% Planes implicit equations are: % a1*x + b1*y + c1*z = d1; % a2*x + b2*y + c2*z = d2; % a1 = 256; b1=0; c1=0; d1=0; ...

10 days ago | 1

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Answered
subsref works as not expected
I knew it for sometime: subsref never work to emulate comma list (not sure if it's documented), because a non trivial comma list...

10 days ago | 0

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Answered
Quadratic-Equation-Constrained Optimization
There is https://www.mathworks.com/help/optim/ug/coneprog.html but only for linear objective function. You migh iterate on b...

10 days ago | 0

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Resize and sum a matrix
If you isist on "resize" array1 =[1 2 3 4 5 6 7 8 9 10 11 12 13 ...

11 days ago | 0

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Preallocating a structure with a changing number of rows within a field
There is no need to preallocate a field (or in fact any variable) if you don't grow the array itself in a loop, which is your ca...

13 days ago | 0

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Find out number of bits needed to represent a positive integer in binary?
>> I=0:9 I = 0 1 2 3 4 5 6 7 8 9 >> n=nextpow2(I+1) n = 0 1 ...

13 days ago | 1

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How to use min function so that it stops at the first minimum value in a column matrix, stores values, and then continues going until it finishes the entire matrix? (details below)
A=[0.200 0.300 0.400 0.001 0.002 0.003 0.004 0.003 0.002 0.001] imin=find(A==min(A)); lgt=diff(union(imin,[0 length(A)])) C...

13 days ago | 0

Answered
Generation of Conditional Random Variables
I don't quite understand what you want but from your request you seem to compute X1 = C1 * S X2 = C2 * S ... X16 = C16 * S ...

13 days ago | 0

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Answered
Obtain a random number from a truncated normal distribution
In theory if you range is something +/-0.9*0.03 the maximum possible standard deviation you can reach with a truncated gaussian ...

14 days ago | 0

Submitted

find_idx
Fractional binning

15 days ago | 2 downloads |

Answered
Convert a symmetrical 4D array into a vector of it's degrees of freedom and vice-versa
% A = zeros(7,7,7,7); n = length(A); % 7 m = ndims(A); % 4 C = cell(1,m); [C{:}] = ndgrid(1:n); I = reshape(cat(m+1,C{...

15 days ago | 0

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Answered
Memory usage of functions like pause()
Pause by itself would not causes any issue. But as side effect it releases other parallel pending tasks and those might have mem...

15 days ago | 0

Answered
How to get fminimax work for both max and min objectives?
I wouldn't use fminmax. I would use linprog to maximize q as subfunction, and fmincon to minimize z,b. Beside you should tran...

15 days ago | 1

Answered
Condition number of Hilbert matrix depending on MATLAB build??
You and the students should NOT expect COND returns identical result, especially for ill-conditionned matrix like Hilbert matrix...

16 days ago | 0

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Answered
Replace some values of a vector with values from another vector of the same size
Simply C = max(A,B)

16 days ago | 1

Answered
Solving a simple vectorial equation with one unknown
fsolve requires the number of unknowns == number of equations. This is the least-square solution f = @(x)norm([cross(OP,x*CD) ...

17 days ago | 0