5.503 total contributions since 2014

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Answered

Help with nested structure

This would be much easier if you had designed your data better. In particular, rather than using nested structures (which are r...

Help with nested structure

This would be much easier if you had designed your data better. In particular, rather than using nested structures (which are r...

ongeveer 12 uur ago | 0

Answered

While loop with for loop problem

Perhaps you meant something like this: D = [3 0 0; 0 2 0; 0 0 1]; b = [0; 1; 0]; L = [0 0 0; 1 0 0; 0 1 0]; U = [0 1 0; 0 0 ...

While loop with for loop problem

Perhaps you meant something like this: D = [3 0 0; 0 2 0; 0 0 1]; b = [0; 1; 0]; L = [0 0 0; 1 0 0; 0 1 0]; U = [0 1 0; 0 0 ...

ongeveer 13 uur ago | 0

Answered

Opening mat files with uiopen and copying data to array

It seems that whoever created those .mat files unfortunately named each structure with the same name as the filename, which just...

Opening mat files with uiopen and copying data to array

It seems that whoever created those .mat files unfortunately named each structure with the same name as the filename, which just...

2 dagen ago | 0

| accepted

Answered

TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)

Slow The MATLAB documentation Alternatives to the eval Function explains that code that uses eval is slower because "MATLAB® co...

TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)

Slow The MATLAB documentation Alternatives to the eval Function explains that code that uses eval is slower because "MATLAB® co...

2 dagen ago | 7

Answered

How do I extract the same field from diferent struct files with names like AAA_1, AAA_2... AAA_n?

I suspect that ScanImage is badly written and saves variables (e.g. structures) with a different name in each .mat file. This ma...

How do I extract the same field from diferent struct files with names like AAA_1, AAA_2... AAA_n?

I suspect that ScanImage is badly written and saves variables (e.g. structures) with a different name in each .mat file. This ma...

2 dagen ago | 1

| accepted

Answered

Average of several (different, across) structures

Fake data in scalar structures: S1 = struct('A',randi(99,4,3,2),'B',randi(99,4,3,2)); S2 = struct('A',randi(99,4,3,2),'B',rand...

Average of several (different, across) structures

Fake data in scalar structures: S1 = struct('A',randi(99,4,3,2),'B',randi(99,4,3,2)); S2 = struct('A',randi(99,4,3,2),'B',rand...

2 dagen ago | 0

Answered

Keeping record of Number of concatenated files

Inside your loop: N = ... the total number of files. C = cell(1,N) for k = 1:N M = ... import the matrix here. M(:,...

Keeping record of Number of concatenated files

Inside your loop: N = ... the total number of files. C = cell(1,N) for k = 1:N M = ... import the matrix here. M(:,...

3 dagen ago | 0

Answered

How to find out whether there is a repetitive element in the columns of a matrix?

"I just want to know whether there is or not." >> any(diff(sort(a,1),1)==0,1) ans = 1 1 0

How to find out whether there is a repetitive element in the columns of a matrix?

"I just want to know whether there is or not." >> any(diff(sort(a,1),1)==0,1) ans = 1 1 0

3 dagen ago | 2

Answered

TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)

Alternative: save the Fields of a Scalar Structure The save command has an option for saving the fields of a scalar structure a...

TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)

Alternative: save the Fields of a Scalar Structure The save command has an option for saving the fields of a scalar structure a...

3 dagen ago | 0

Answered

TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)

Alternative: load into a Structure, not into the Workspace In almost all cases where data is imported programmatically (i.e. no...

TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)

Alternative: load into a Structure, not into the Workspace In almost all cases where data is imported programmatically (i.e. no...

3 dagen ago | 5

Question

TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)

Sometimes beginners (and some self-taught professors) think it would be a good idea to dynamically create or access variable nam...

3 dagen ago | 18 answers | 30

Answered

Finding arrays above threshold value

Fake data: AT(1).AX = rand(1,370); AT(2).AX = rand(1,1007); AT(3).AX = rand(1,3957); AT(4).AX = rand(1,6309); AT(5).AX = ra...

Finding arrays above threshold value

Fake data: AT(1).AX = rand(1,370); AT(2).AX = rand(1,1007); AT(3).AX = rand(1,3957); AT(4).AX = rand(1,6309); AT(5).AX = ra...

4 dagen ago | 1

| accepted

Answered

How to Convert a column with Char in Cell matrice to Number?

You almost got it right, you just need to split the numeric array into a cell array so that it can be allocated back to the cell...

How to Convert a column with Char in Cell matrice to Number?

You almost got it right, you just need to split the numeric array into a cell array so that it can be allocated back to the cell...

4 dagen ago | 0

Answered

Could anyone help me how to solve the issue.

Using very basic MATLAB indexing: A = {[1,2],[3,4],[7,5,6]}; N = numel(A); Z = nan(1,N); for k = 1:N Z(k) ... your code...

Could anyone help me how to solve the issue.

Using very basic MATLAB indexing: A = {[1,2],[3,4],[7,5,6]}; N = numel(A); Z = nan(1,N); for k = 1:N Z(k) ... your code...

4 dagen ago | 0

| accepted

Answered

Create a 20x24 matrix with each individual column with random integers without duplicate

You do not need a loop, here is a much simpler solution in just one line: >> [~,M] = sort(rand(20,24),1) M = 16 20 17 ...

Create a 20x24 matrix with each individual column with random integers without duplicate

You do not need a loop, here is a much simpler solution in just one line: >> [~,M] = sort(rand(20,24),1) M = 16 20 17 ...

4 dagen ago | 0

Answered

How to dissect a file path and keep extension Matlab

Do NOT use path as a variable name! This shadows the important inbuilt path function. To get the file extension use fileparts: ...

How to dissect a file path and keep extension Matlab

Do NOT use path as a variable name! This shadows the important inbuilt path function. To get the file extension use fileparts: ...

5 dagen ago | 1

| accepted

Answered

Why does the text file does not show me lines printed on next lines even when i used '\n' while printing the data in Matlab?

You should fopen the file in TEXT mode: fid = fopen(....'wt') % ^ TEXT mode! Or alternatively stop using retr...

Why does the text file does not show me lines printed on next lines even when i used '\n' while printing the data in Matlab?

You should fopen the file in TEXT mode: fid = fopen(....'wt') % ^ TEXT mode! Or alternatively stop using retr...

5 dagen ago | 0

| accepted

Answered

How to get the value of exponential power?

Just use log10: >> floor(log10(a)) ans = -12 -13 The correct answer is [-12,-13], not [12,13] (because these are the powe...

How to get the value of exponential power?

Just use log10: >> floor(log10(a)) ans = -12 -13 The correct answer is [-12,-13], not [12,13] (because these are the powe...

5 dagen ago | 1

| accepted

Answered

Write to text file

You fopen-ed the file in read mode and not write mode (because the default mode is read mode and you did not specify any other m...

Write to text file

You fopen-ed the file in read mode and not write mode (because the default mode is read mode and you did not specify any other m...

6 dagen ago | 1

| accepted

Answered

Matrix with full combinations of vectors'/matrices' elements

>> A = [1;2;3]; % Column vector! >> B = [4,5;6,7]; >> C = [8,9;10,11]; >> D = [12;13]; % Column vector! >> An = size(A,1); ...

Matrix with full combinations of vectors'/matrices' elements

>> A = [1;2;3]; % Column vector! >> B = [4,5;6,7]; >> C = [8,9;10,11]; >> D = [12;13]; % Column vector! >> An = size(A,1); ...

7 dagen ago | 0

Answered

Making a array that gives me this kind of data...?

>> xp=5; >> x1=1.5; >> depth=2.3; >> Xv = -xp:0.1:xp; >> Yv = min(0,depth*abs(Xv)/x1 - depth); >> plot(Xv,Yv,'-*')

Making a array that gives me this kind of data...?

>> xp=5; >> x1=1.5; >> depth=2.3; >> Xv = -xp:0.1:xp; >> Yv = min(0,depth*abs(Xv)/x1 - depth); >> plot(Xv,Yv,'-*')

7 dagen ago | 1

| accepted

Answered

Sum Numbers Excluding Zeros

Simpler solution using accumarray: >> x = [0,0,0,1,0,2,2,3,4,0,0,0,0,7,8,2,2,0,3,0]; >> y = cumsum(x==0 | [true,x(1:end-1)==0]...

Sum Numbers Excluding Zeros

Simpler solution using accumarray: >> x = [0,0,0,1,0,2,2,3,4,0,0,0,0,7,8,2,2,0,3,0]; >> y = cumsum(x==0 | [true,x(1:end-1)==0]...

7 dagen ago | 1

Answered

How to compare each element of an array with the rest of the elements for several rows independently?

Because each array has a different size you will have to use a cell array: A = [1 1,0,1,1,0;0,0,1,0,0,1;0,0,0,1,1,1;1,1,1,1,1,1...

How to compare each element of an array with the rest of the elements for several rows independently?

Because each array has a different size you will have to use a cell array: A = [1 1,0,1,1,0;0,0,1,0,0,1;0,0,0,1,1,1;1,1,1,1,1,1...

7 dagen ago | 1

| accepted

Answered

Not enough input arguments

You need to parameterize the objective function supplied to fsolve: https://www.mathworks.com/help/matlab/math/parameterizing-f...

Not enough input arguments

You need to parameterize the objective function supplied to fsolve: https://www.mathworks.com/help/matlab/math/parameterizing-f...

8 dagen ago | 2

Answered

How to edit a number in a text file and save a copy of the file multiple times?

vec = [23,5]; % new values cnt = 0; rgx = '^(\s*\S+\s+)(\S+)(.+gamma.+)$'; f1d = fopen( 'input_matlab.txt','rt'); f2d = fope...

How to edit a number in a text file and save a copy of the file multiple times?

vec = [23,5]; % new values cnt = 0; rgx = '^(\s*\S+\s+)(\S+)(.+gamma.+)$'; f1d = fopen( 'input_matlab.txt','rt'); f2d = fope...

8 dagen ago | 1

| accepted

Answered

What function returns (as an integer) the number of bits in a data type or class, e.g. returns 16 for 'int16' or 'uint16' variables, 32 (or whatever) for 'float' types, etc.?

>> A = single(0); >> S = whos('A'); >> S.class ans = single >> S.bytes*8 ans = 32 If you have non-scalar arrays to get th...

What function returns (as an integer) the number of bits in a data type or class, e.g. returns 16 for 'int16' or 'uint16' variables, 32 (or whatever) for 'float' types, etc.?

>> A = single(0); >> S = whos('A'); >> S.class ans = single >> S.bytes*8 ans = 32 If you have non-scalar arrays to get th...

9 dagen ago | 1

Answered

Find the index of given value in an array

Much simpler (and also works for multiple val values): interp1(array,1:numel(array),val) For example: >> array = [2,4,5,7,8,9...

Find the index of given value in an array

Much simpler (and also works for multiple val values): interp1(array,1:numel(array),val) For example: >> array = [2,4,5,7,8,9...

9 dagen ago | 2

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Answered

realmax + 1 infinity?

Because the value 1 is nowhere near the smallest value that can be added to realmax to create a new value. You would need to add...

realmax + 1 infinity?

Because the value 1 is nowhere near the smallest value that can be added to realmax to create a new value. You would need to add...

9 dagen ago | 3

| accepted

Answered

Function having string as argument

I would not recommend using a string to define the input function. A much more reliable way would be to write your code to acce...

Function having string as argument

I would not recommend using a string to define the input function. A much more reliable way would be to write your code to acce...

9 dagen ago | 1

| accepted