12.401 total contributions since 2009

It is easier to solve a problem than to guess, what the problem is.

Questions about FileExchange submissions are welcome - get my address from the code. I do not answer mails concerning questions in the forum.

Answered

Need help creating a for loop

v = nonzeros((5:5:95).' .* fliplr(triu(ones(19)))).'

Need help creating a for loop

v = nonzeros((5:5:95).' .* fliplr(triu(ones(19)))).'

circa 8 ore ago | 0

Answered

How to write strings and numbers to a text file

Do you really want to create: *DIM,table_press_data_1,TABLE,6146,120,1,PN,PT *TREAD,table_press_data_1,'press_data_1','csv',''...

How to write strings and numbers to a text file

Do you really want to create: *DIM,table_press_data_1,TABLE,6146,120,1,PN,PT *TREAD,table_press_data_1,'press_data_1','csv',''...

circa 12 ore ago | 0

Answered

Why is ODE45 using so many intervals?

Do you want to reduce the number of evaluated steps to reduce the processing time, or is it enough to reduce the size of teh out...

Why is ODE45 using so many intervals?

Do you want to reduce the number of evaluated steps to reduce the processing time, or is it enough to reduce the size of teh out...

1 giorno ago | 1

Answered

Rotating 3D cloud matrix data

Multiplacte the data with a rotation matrix, e.g. obtained by: https://www.mathworks.com/matlabcentral/fileexchange/66446-rotati...

Rotating 3D cloud matrix data

Multiplacte the data with a rotation matrix, e.g. obtained by: https://www.mathworks.com/matlabcentral/fileexchange/66446-rotati...

1 giorno ago | 0

Answered

What is the efficient way to parse file without fscanf or testscan

I've created a test file at first: fid = fopen('myfile.txt', 'w'); fprintf(fid,'%.0g %16f %16f %16f %8f %8f\n', rand(6, n)); ...

What is the efficient way to parse file without fscanf or testscan

I've created a test file at first: fid = fopen('myfile.txt', 'w'); fprintf(fid,'%.0g %16f %16f %16f %8f %8f\n', rand(6, n)); ...

2 giorni ago | 0

| accepted

Answered

How can I convert a binary fraction to decimal?

'11001' means: 1*2^0 + 0*2^1 + 0*2^2 + 1*2^3 + 1*2^4 or: [1,1,0,0,1] * 2 .^ (4:-1:0).' (this is what happens inside bin2dec - ...

How can I convert a binary fraction to decimal?

'11001' means: 1*2^0 + 0*2^1 + 0*2^2 + 1*2^3 + 1*2^4 or: [1,1,0,0,1] * 2 .^ (4:-1:0).' (this is what happens inside bin2dec - ...

2 giorni ago | 1

Answered

Gridlines when exporting .pdf in Word 2016

You can replace the grid my drawing the lines manually with the wanted color. Would this solve the problem? aAxesH = axes('Next...

Gridlines when exporting .pdf in Word 2016

You can replace the grid my drawing the lines manually with the wanted color. Would this solve the problem? aAxesH = axes('Next...

2 giorni ago | 0

Answered

How do you remove duplicates of nested cells?

A loop appraoch: C = RomanticGestures; n = numel(C); remove = false(1, n); for i1 = 1:n for i2 = i1 + 1:n if ~...

How do you remove duplicates of nested cells?

A loop appraoch: C = RomanticGestures; n = numel(C); remove = false(1, n); for i1 = 1:n for i2 = i1 + 1:n if ~...

3 giorni ago | 0

Answered

"not equal to" in MATLAB

Several possible ways: if 1 ~= 2 if not(1 == 2) if ~(1==2) if ne(1, 2) if ~eq(1, 2) if 1 - 2 % Implicitly eva...

"not equal to" in MATLAB

Several possible ways: if 1 ~= 2 if not(1 == 2) if ~(1==2) if ne(1, 2) if ~eq(1, 2) if 1 - 2 % Implicitly eva...

4 giorni ago | 2

Answered

Parameter in my ode

See Answers: Anonymous functions for parameters and https://www.mathworks.com/help/matlab/math/parameterizing-functions.html (y...

Parameter in my ode

See Answers: Anonymous functions for parameters and https://www.mathworks.com/help/matlab/math/parameterizing-functions.html (y...

4 giorni ago | 1

Answered

How to generate random points within 3d pyramid

See: https://www.mathworks.com/matlabcentral/answers/327990-generate-random-coordinates-inside-a-convex-polytope https://www.m...

How to generate random points within 3d pyramid

See: https://www.mathworks.com/matlabcentral/answers/327990-generate-random-coordinates-inside-a-convex-polytope https://www.m...

6 giorni ago | 0

Answered

desactivation of the "MATLAB system error" dialog box ?

I'm running a long test also. The code displays some logging messages every few seconds. A second Matlab session takes a screens...

desactivation of the "MATLAB system error" dialog box ?

I'm running a long test also. The code displays some logging messages every few seconds. A second Matlab session takes a screens...

6 giorni ago | 0

Answered

How can I add a line to an imagec figure?

Maybe (see my comment above): line(t([3952, 3952]), altitude([1, end]))

How can I add a line to an imagec figure?

Maybe (see my comment above): line(t([3952, 3952]), altitude([1, end]))

6 giorni ago | 0

| accepted

Answered

How do I add an additional column to a cell array based on existing values in another column?

x = {'asd', 1; ... 'bsd', 0}; x(:, 3) = num2cell(1 - cell2mat(x(:, 2))) % or: Value = {0, 1}; x(:, 3) = Value(2 - ce...

How do I add an additional column to a cell array based on existing values in another column?

x = {'asd', 1; ... 'bsd', 0}; x(:, 3) = num2cell(1 - cell2mat(x(:, 2))) % or: Value = {0, 1}; x(:, 3) = Value(2 - ce...

7 giorni ago | 0

Answered

Strategies for reducing calculation time: Finding values in a large array

[uniqID, ~, index] = unique(RawData(:, 1)); avg = accumarray(index, RawData(:, 2), [], @mean); result = [uniqID, avg]; Do ...

Strategies for reducing calculation time: Finding values in a large array

[uniqID, ~, index] = unique(RawData(:, 1)); avg = accumarray(index, RawData(:, 2), [], @mean); result = [uniqID, avg]; Do ...

7 giorni ago | 0

| accepted

Answered

Rolling-window matrix with different intervals between columns.

vec = [1 2 3 4 5 6 7 8 9 10 11 12 13]; n = numel(vec); step = 3; width = 4; col1 = 1:step:n - width + 1; row1 ...

Rolling-window matrix with different intervals between columns.

vec = [1 2 3 4 5 6 7 8 9 10 11 12 13]; n = numel(vec); step = 3; width = 4; col1 = 1:step:n - width + 1; row1 ...

7 giorni ago | 0

Answered

Index exceeds number of array elements (181)

Use the debugger to examine the cause of the problems. Type this in the command window: dbstop if error Then run the code agai...

Index exceeds number of array elements (181)

Use the debugger to examine the cause of the problems. Type this in the command window: dbstop if error Then run the code agai...

7 giorni ago | 0

Answered

Mathematics of the bandpass function

The documentation explains: bandpass uses a minimum-order filter with a stopband attenuation of 60 dB and compensates for the d...

Mathematics of the bandpass function

The documentation explains: bandpass uses a minimum-order filter with a stopband attenuation of 60 dB and compensates for the d...

7 giorni ago | 0

Answered

Fast Elementwise Matrix-Multiplications

Of course times is implemented efficiently already and most likely it does use the MKL, but this is not documented and a reverse...

Fast Elementwise Matrix-Multiplications

Of course times is implemented efficiently already and most likely it does use the MKL, but this is not documented and a reverse...

8 giorni ago | 1

| accepted

Answered

a 2D into a 3D Array

Prefer Shunichi Kusano's solution. But for completeness: ini = 1; fin = 9; a = zeros(9, 2049, 3867); m = size(PICT, 1); ...

a 2D into a 3D Array

Prefer Shunichi Kusano's solution. But for completeness: ini = 1; fin = 9; a = zeros(9, 2049, 3867); m = size(PICT, 1); ...

8 giorni ago | 1

Answered

Difficulty to get the results by using repmat function

I'm not sure, what you are asking for. With some guessing: a1 = eomday(d(:,1),d(:,2)); index = repelem((1:size(b, 1)).', a1...

Difficulty to get the results by using repmat function

I'm not sure, what you are asking for. With some guessing: a1 = eomday(d(:,1),d(:,2)); index = repelem((1:size(b, 1)).', a1...

8 giorni ago | 0

| accepted

Answered

How to use matlab to call c + function file and draw？

What about converting the code to Matlab? This is more or less trivial: function cdValue = yourFcn(Kc, Re) cdValue=0.0; % Do ...

How to use matlab to call c + function file and draw？

What about converting the code to Matlab? This is more or less trivial: function cdValue = yourFcn(Kc, Re) cdValue=0.0; % Do ...

8 giorni ago | 0

| accepted

Answered

Variable is in a function file, how do I use a loop to change the value of this variable?

Do not redefine the important Matlab function cd as a variable, because this can cause serious troubles during debugging. [T,Z]...

Variable is in a function file, how do I use a loop to change the value of this variable?

Do not redefine the important Matlab function cd as a variable, because this can cause serious troubles during debugging. [T,Z]...

8 giorni ago | 1

Answered

Matlab Novice here - struggling to truncate a column array

cellfun(@(x) x(18:19), C, 'UniformOutput', false)

Matlab Novice here - struggling to truncate a column array

cellfun(@(x) x(18:19), C, 'UniformOutput', false)

8 giorni ago | 0

Answered

Data Tips -- Add Row Error

Did you read the example https://www.mathworks.com/help/matlab/creating_plots/create-custom-data-tips.html and https://www.mathw...

Data Tips -- Add Row Error

Did you read the example https://www.mathworks.com/help/matlab/creating_plots/create-custom-data-tips.html and https://www.mathw...

8 giorni ago | 0

Answered

create vector from 21 individual values from for-loop

K = zeros(1, 21); % Pre-allocation for ii = 1:21 K(ii) = rand; % Insert your calculations here end If you post your co...

create vector from 21 individual values from for-loop

K = zeros(1, 21); % Pre-allocation for ii = 1:21 K(ii) = rand; % Insert your calculations here end If you post your co...

8 giorni ago | 0

Answered

Errors after removal of appdata folder

The question is very vague. "unique() function isn't working properly" doies not contain any detail which would allow to underst...

Errors after removal of appdata folder

The question is very vague. "unique() function isn't working properly" doies not contain any detail which would allow to underst...

8 giorni ago | 0

| accepted

Answered

Comparing input character and a String

Of course a(1) and a1 are two completely different things. It is not clear, what the contents of b1 is, but maybe you want: b1 ...

Comparing input character and a String

Of course a(1) and a1 are two completely different things. It is not clear, what the contents of b1 is, but maybe you want: b1 ...

8 giorni ago | 1

| accepted

Answered

How to speed up pairwise difference calculation between vectors under certain condition?

Instead of creating the huge index matrix abs(B-A(i))<=maxdif in each iteration, it is cheaper to search the lower and upper lim...

How to speed up pairwise difference calculation between vectors under certain condition?

Instead of creating the huge index matrix abs(B-A(i))<=maxdif in each iteration, it is cheaper to search the lower and upper lim...

10 giorni ago | 0

| accepted

Answered

I have 30x30 matrix and need to extrapolate lower triangle numbers

x = rand(5, 5); y = x(tril(true(size(x)))) What is the reason to avoid tril? Maybe: s = size(x); y = x((1:s(1)).' >= (1:s2)...

I have 30x30 matrix and need to extrapolate lower triangle numbers

x = rand(5, 5); y = x(tril(true(size(x)))) What is the reason to avoid tril? Maybe: s = size(x); y = x((1:s(1)).' >= (1:s2)...

10 giorni ago | 1