Answered
how to use a for cycle with strings as variables
As soon as you do not hide indices in the names of variables, but use arrays instead, the code is trivial: for k = 1:10 writ...
how to use a for cycle with strings as variables
As soon as you do not hide indices in the names of variables, but use arrays instead, the code is trivial: for k = 1:10 writ...
4 years ago | 0
| accepted
Answered
Using an external array in ode45
This cannot work for several reasons: ODE45 is designe to integrate smooth functions with a certain accuracy. Using non-smooth ...
Using an external array in ode45
This cannot work for several reasons: ODE45 is designe to integrate smooth functions with a certain accuracy. Using non-smooth ...
4 years ago | 1
| accepted
Answered
How to get the correct answer for LU Decomposition with partial pivoting?
You forgot to apply the permutation matrix P to b. The results are correct: P * L * U - A % == zeros, fine b = P * b; Then ...
How to get the correct answer for LU Decomposition with partial pivoting?
You forgot to apply the permutation matrix P to b. The results are correct: P * L * U - A % == zeros, fine b = P * b; Then ...
4 years ago | 0
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Answered
searching first two consecutive ones and set to 0
y = [0 0 1 1 1 1 1 1 1 1 1]; index = strfind(y, [1, 1]); if any(index) y(index(1):index(1)+1) = 0; end y
searching first two consecutive ones and set to 0
y = [0 0 1 1 1 1 1 1 1 1 1]; index = strfind(y, [1, 1]); if any(index) y(index(1):index(1)+1) = 0; end y
4 years ago | 0
Answered
Apply logical mask to every matrix in array
B = reshape(1:24, 2,3,4); mask = logical([1,0,1; 0,1,0]); sB = size(B); B = reshape(B, [], sB(3)); % Join the first tw...
Apply logical mask to every matrix in array
B = reshape(1:24, 2,3,4); mask = logical([1,0,1; 0,1,0]); sB = size(B); B = reshape(B, [], sB(3)); % Join the first tw...
4 years ago | 0
Answered
define a pattern to use with dir and get the file names containing numbers
This does not work with the patterns of the operating system. Use a regexp call to filter the names instead: List = dir('*.t...
define a pattern to use with dir and get the file names containing numbers
This does not work with the patterns of the operating system. Use a regexp call to filter the names instead: List = dir('*.t...
4 years ago | 1
| accepted
Answered
Suppressing outputs (ans) in MATLAB
You need a semicolon after the call of the function: paths = CEVPaths(S,r,q,vol0,beta,T,N,NPaths); % ...
Suppressing outputs (ans) in MATLAB
You need a semicolon after the call of the function: paths = CEVPaths(S,r,q,vol0,beta,T,N,NPaths); % ...
4 years ago | 1
Answered
Error using second . Invalid date/time class. (I am working on guide)
A bold guess: persistent timein if x >= p_x(1) && x <= p_x(2) && y >= p_y(1) && y <= p_y(2) timein = datetime('now'); ...
Error using second . Invalid date/time class. (I am working on guide)
A bold guess: persistent timein if x >= p_x(1) && x <= p_x(2) && y >= p_y(1) && y <= p_y(2) timein = datetime('now'); ...
4 years ago | 1
Answered
want a rows to split into multiple rows
X = ones(1, 90); Y = reshape(X, 3, []); % 2nd argument is determined automatically % The long form: Y = reshape(X, 3, nume...
want a rows to split into multiple rows
X = ones(1, 90); Y = reshape(X, 3, []); % 2nd argument is determined automatically % The long form: Y = reshape(X, 3, nume...
4 years ago | 0
| accepted
Answered
invalid index in program
Use the debugger to examine the cause of problems. Type this in the command window: dbstop if error Run the code again until i...
invalid index in program
Use the debugger to examine the cause of problems. Type this in the command window: dbstop if error Run the code again until i...
4 years ago | 0
Answered
MATLAB R2021b error running installer
What does the event viewer tell you about the occurring problems? Do you try to run the installer from the protected download f...
MATLAB R2021b error running installer
What does the event viewer tell you about the occurring problems? Do you try to run the installer from the protected download f...
4 years ago | 0
Answered
How do I find the mean of certain parts of a cell array?
This is easy, if you store the values in a numerical array instead of a cell. Why do you prefer a cell array? But you can creat...
How do I find the mean of certain parts of a cell array?
This is easy, if you store the values in a numerical array instead of a cell. Why do you prefer a cell array? But you can creat...
4 years ago | 0
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Answered
If value in one vector is in another, assign the value of the other column of the second vector to a third
I do not understand exactly, what you are asking for. A guess: T = 0:20; s = zeros(1, numel(T)); stimuli = [4 8 14 2 16 6 15 ...
If value in one vector is in another, assign the value of the other column of the second vector to a third
I do not understand exactly, what you are asking for. A guess: T = 0:20; s = zeros(1, numel(T)); stimuli = [4 8 14 2 16 6 15 ...
4 years ago | 0
Answered
the length of the time span in ode45
The small discretization and rounding errors accumulate over the time. Small deviations of the initial values can be amplified a...
the length of the time span in ode45
The small discretization and rounding errors accumulate over the time. Small deviations of the initial values can be amplified a...
4 years ago | 1
| accepted
Answered
sort 4th dimension of a 4D matrix with indexing
Maybe you mean: for i=1:83 % vols(:,:,:,i)=vols_sorted(:,:,:, bSortIdx(i)); vols_sorted(:,:,:,i) = vols(:,:,:, bSortI...
sort 4th dimension of a 4D matrix with indexing
Maybe you mean: for i=1:83 % vols(:,:,:,i)=vols_sorted(:,:,:, bSortIdx(i)); vols_sorted(:,:,:,i) = vols(:,:,:, bSortI...
4 years ago | 1
| accepted
Answered
Trying to get the user to input consecutive values
for i = 1:length(Rtot) If Rtot is a scalar, the loop runs one time only. I guess you want: for i = 1:Rtot The message "What i...
Trying to get the user to input consecutive values
for i = 1:length(Rtot) If Rtot is a scalar, the loop runs one time only. I guess you want: for i = 1:Rtot The message "What i...
4 years ago | 1
Answered
I CODED THE PROGRAM BUT DON'T KNOW WHY STATEMENT IS NOT SHOWING, Using the singular value decomposition, prove that σ¯(AB) ≤ σ¯(A)¯σ(B)
The problem is: for i=10: size(A, 1) size(A, 1) replies 5. Then the loop from 10 up to 5 is not entered at all. Do you mean: ...
I CODED THE PROGRAM BUT DON'T KNOW WHY STATEMENT IS NOT SHOWING, Using the singular value decomposition, prove that σ¯(AB) ≤ σ¯(A)¯σ(B)
The problem is: for i=10: size(A, 1) size(A, 1) replies 5. Then the loop from 10 up to 5 is not entered at all. Do you mean: ...
4 years ago | 1
| accepted
Answered
Write a function that gives a tree with one input
n = 9; disp(char(10 * (abs(-n+1:n-1) < (1:n).') + ' ')) Or with a function: affAbre(n) function affAbre(n) s = repmat(' '...
Write a function that gives a tree with one input
n = 9; disp(char(10 * (abs(-n+1:n-1) < (1:n).') + ' ')) Or with a function: affAbre(n) function affAbre(n) s = repmat(' '...
4 years ago | 0
Answered
Vectorising Multiplying each column from a matrix with a square matrix and the tranpose of this column
Then please post you code. It is much faster on my computer: h = rand(2790, 3591); Pn = rand(2790, 2790); tic R = zeros(1,...
Vectorising Multiplying each column from a matrix with a square matrix and the tranpose of this column
Then please post you code. It is much faster on my computer: h = rand(2790, 3591); Pn = rand(2790, 2790); tic R = zeros(1,...
4 years ago | 0
Answered
How to convert table to a csv file and save it in a remote location?
Folder = 'D:\Your\Folder'; File = [all_files(k).name(1:end-8) '_.csv']; writematrix(Stats, fullfile(Folder, File));
How to convert table to a csv file and save it in a remote location?
Folder = 'D:\Your\Folder'; File = [all_files(k).name(1:end-8) '_.csv']; writematrix(Stats, fullfile(Folder, File));
4 years ago | 0
| accepted
Submitted
WindowAPI
Set figure size, top-most, transparency and pixel mask, multi-monitor etc by Windows API
4 years ago | 6 downloads |
Answered
Generate a sine wave that has no stop-time
f = 5; a = 1; Fs = 1000; t1 = 1; figure; while 1 % Runs until you press Ctrl-c t = 0 : 1/Fs :t1-1/Fs; x =...
Generate a sine wave that has no stop-time
f = 5; a = 1; Fs = 1000; t1 = 1; figure; while 1 % Runs until you press Ctrl-c t = 0 : 1/Fs :t1-1/Fs; x =...
4 years ago | 0
| accepted
Answered
Using number/counter instead of changing all variables names that end on same index
Do not hoide indices in the names of variables. This is a standard pitfall for beginners and discussed frequently. Use real indi...
Using number/counter instead of changing all variables names that end on same index
Do not hoide indices in the names of variables. This is a standard pitfall for beginners and discussed frequently. Use real indi...
4 years ago | 0
| accepted
Answered
How to simplify code into a for loop?
M_diag = rand(4,4); C_diag = rand(4,4); K_diag = rand(4,4); a = phi(1:4, 1); q_f = a ./ (diag(M_diag) .* s .^ 2 + diag(C...
How to simplify code into a for loop?
M_diag = rand(4,4); C_diag = rand(4,4); K_diag = rand(4,4); a = phi(1:4, 1); q_f = a ./ (diag(M_diag) .* s .^ 2 + diag(C...
4 years ago | 0
| accepted
Answered
TUTORIAL: Comma-Separated Lists and How to Use Them
An interesting application of comma-separated lists are dynamic indexing. You can use it to extract a specific dimension of a mu...
TUTORIAL: Comma-Separated Lists and How to Use Them
An interesting application of comma-separated lists are dynamic indexing. You can use it to extract a specific dimension of a mu...
4 years ago | 2
Answered
how to write summation
S = 0; for p = 1:i+1 % Indices are 1-based in Matlab S = S + A(p) + C(i - p); end
how to write summation
S = 0; for p = 1:i+1 % Indices are 1-based in Matlab S = S + A(p) + C(i - p); end
4 years ago | 1
Answered
delate a specific number in an array and the number that have the index corresponding to the this number in an other array
A=[0,0,3,4,5,6,7,8,9,0]; B=[10,9,8,7,6,5,4,3,2,1]; match = (A == 0); A(match) = [] B(match) = [] Or the other way around:...
delate a specific number in an array and the number that have the index corresponding to the this number in an other array
A=[0,0,3,4,5,6,7,8,9,0]; B=[10,9,8,7,6,5,4,3,2,1]; match = (A == 0); A(match) = [] B(match) = [] Or the other way around:...
4 years ago | 1
| accepted
Answered
Not sure what's wrong with my code
The providing of variables as inputs and outputs as well as sharing the data using nested cells is explained in the free online ...
Not sure what's wrong with my code
The providing of variables as inputs and outputs as well as sharing the data using nested cells is explained in the free online ...
4 years ago | 0
Answered
I am having a hard time understanding how matrix works.
.* is the elementwise multiplication, while * is the matrix multiplication: [a,b; c,d] .* [e,f; g,h] = [a*e, b*f; c*g, d*h] ...
I am having a hard time understanding how matrix works.
.* is the elementwise multiplication, while * is the matrix multiplication: [a,b; c,d] .* [e,f; g,h] = [a*e, b*f; c*g, d*h] ...
4 years ago | 0