Answered

Select specific number of random ones placed in a zeros matrix

m = zeros(1024, 1024); m(randperm(numel(m), 20)) = 1; %place 20 ones randomly in m.

Select specific number of random ones placed in a zeros matrix

m = zeros(1024, 1024); m(randperm(numel(m), 20)) = 1; %place 20 ones randomly in m.

3 hours ago | 0

Answered

how to read a string

split = textscan(tline, '%s%f%f%f'); txt = split{1} numbers = cell2mat(split(2:end))

how to read a string

split = textscan(tline, '%s%f%f%f'); txt = split{1} numbers = cell2mat(split(2:end))

3 hours ago | 0

Answered

How do I track the number of instances of a given handle?

I'm curious what you mean by "inheriting that class appears to put a lot of constraints on what I can do with my existing code i...

How do I track the number of instances of a given handle?

I'm curious what you mean by "inheriting that class appears to put a lot of constraints on what I can do with my existing code i...

4 hours ago | 0

Answered

How to get field value from a struct as a variable in order to use in a code?

There's no need to. Creating separate variables is usually not a good idea. Wherever you were going to use X, use yourstruct.X. ...

How to get field value from a struct as a variable in order to use in a code?

There's no need to. Creating separate variables is usually not a good idea. Wherever you were going to use X, use yourstruct.X. ...

4 hours ago | 2

| accepted

Answered

Having trouble finding the mean of array elements between two indices

See my comments to the question. Using a matrix, and assuming you're using R2019b since you haven't indicated a matlab version:...

Having trouble finding the mean of array elements between two indices

See my comments to the question. Using a matrix, and assuming you're using R2019b since you haven't indicated a matlab version:...

5 hours ago | 0

Answered

Add empty cell inside a cell array considering a single array

Surely, by now, with all the questions you've asked, you should be able to manipulate cell arrays yourself. Anyway: desiredlen...

Add empty cell inside a cell array considering a single array

Surely, by now, with all the questions you've asked, you should be able to manipulate cell arrays yourself. Anyway: desiredlen...

6 hours ago | 0

Answered

Is it possible to use a variable name like this within Matlab?

Confusingly, variable names can mean two different things now in matlab. A generic variable name, e.g. >> A = 5 is limited to ...

Is it possible to use a variable name like this within Matlab?

Confusingly, variable names can mean two different things now in matlab. A generic variable name, e.g. >> A = 5 is limited to ...

11 hours ago | 2

| accepted

Answered

Why the threshold is 0.90 used to obtain the white component from RGB channels ?

You will have to ask whoever wrote that code why they chose that threshold. Most likely, the answer will be : because it worked...

Why the threshold is 0.90 used to obtain the white component from RGB channels ?

You will have to ask whoever wrote that code why they chose that threshold. Most likely, the answer will be : because it worked...

12 hours ago | 0

Answered

How to index something based on numbering order???

Here is one way: %input x = [2; 3; 7; 5; 1] %generate random matrix without worrying about the order A = rand(size(x, 1),...

How to index something based on numbering order???

Here is one way: %input x = [2; 3; 7; 5; 1] %generate random matrix without worrying about the order A = rand(size(x, 1),...

12 hours ago | 0

| accepted

Answered

How to assign specific colors to every quiver?

I can't remember if quiver did have children before R2014b (when the graphics system changed drastically) but since R2014b it do...

How to assign specific colors to every quiver?

I can't remember if quiver did have children before R2014b (when the graphics system changed drastically) but since R2014b it do...

17 hours ago | 0

Answered

Why is my regular expression always greedy?

Matlab regex engine has the odd peculiarity that . also matches \n by default, whereas other engines don't. So your greedy .* in...

Why is my regular expression always greedy?

Matlab regex engine has the odd peculiarity that . also matches \n by default, whereas other engines don't. So your greedy .* in...

1 day ago | 0

Answered

Using data from a cell

I need new variables created for each of the character vectors No! As Stephen already told you this would worst way to go about...

Using data from a cell

I need new variables created for each of the character vectors No! As Stephen already told you this would worst way to go about...

1 day ago | 0

Answered

How to create a new table array combining the values every n,th element from two different table arrays

In my case I would like to add every 60 values of A to add 59 consecutive values of B So, assuming that A and B are indeed vect...

How to create a new table array combining the values every n,th element from two different table arrays

In my case I would like to add every 60 values of A to add 59 consecutive values of B So, assuming that A and B are indeed vect...

1 day ago | 0

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Answered

mod gives incorrect result

See my comment to Kalyan's answer for why your naive attempt doesn't work, and learn about floating point numbers so that you ca...

mod gives incorrect result

See my comment to Kalyan's answer for why your naive attempt doesn't work, and learn about floating point numbers so that you ca...

2 days ago | 2

Answered

How do I get my matrix dimensions correct?

t_loading, v_trailertank, and co. (the random variables) are column vectors 1000 rows by 1 columns. To these you are adding x./...

How do I get my matrix dimensions correct?

t_loading, v_trailertank, and co. (the random variables) are column vectors 1000 rows by 1 columns. To these you are adding x./...

2 days ago | 0

Answered

Use rowfun to sum multiple columns by group

rowfun is not the correct function for this. rowfun applies the function by rows and consider the input variables as separate in...

Use rowfun to sum multiple columns by group

rowfun is not the correct function for this. rowfun applies the function by rows and consider the input variables as separate in...

3 days ago | 0

| accepted

Answered

"Index exceeds the number of array elements (11)."

You create a variable called disp: disp = 'RLC Circuit' %removed brackets which didn't anything Which shadows the built-in ...

"Index exceeds the number of array elements (11)."

You create a variable called disp: disp = 'RLC Circuit' %removed brackets which didn't anything Which shadows the built-in ...

3 days ago | 0

| accepted

Answered

What is the default varargin in the GUI callbacks? What are the differences between varargin{1} and varargin{2}.Source?

Yes, as Stephen says in his very thorough comment, that advice is utter rubbish. Don't do that it pointlessly obfuscate the code...

What is the default varargin in the GUI callbacks? What are the differences between varargin{1} and varargin{2}.Source?

Yes, as Stephen says in his very thorough comment, that advice is utter rubbish. Don't do that it pointlessly obfuscate the code...

6 days ago | 0

Answered

I have a Table in MATLAB. In one colum, lots of texts are seperated in comma. I wish to delimate those in seperate colums.

It's not clear what you want as an output since for each row you're going to get a different number of elements after the split....

I have a Table in MATLAB. In one colum, lots of texts are seperated in comma. I wish to delimate those in seperate colums.

It's not clear what you want as an output since for each row you're going to get a different number of elements after the split....

6 days ago | 0

| accepted

Answered

mat lab terms of use

For this you should contact Mathworks directly. We're just a bunch of volunteers here.

mat lab terms of use

For this you should contact Mathworks directly. We're just a bunch of volunteers here.

9 days ago | 0

Answered

Create an array iterating on another array

If I understood correctly: out = zeros(size(N)); for row = 1:size(N, 1) [isfound, where] = ismember(SP, G{row}(1, :)); %...

Create an array iterating on another array

If I understood correctly: out = zeros(size(N)); for row = 1:size(N, 1) [isfound, where] = ismember(SP, G{row}(1, :)); %...

9 days ago | 0

| accepted

Answered

Create new .wav files around findpeak outputs

Here's how I'd do it: infile = 'C:\somewhere\somefolder\test_100m.wav'; %I'd recommend you use full path instead of relying on...

Create new .wav files around findpeak outputs

Here's how I'd do it: infile = 'C:\somewhere\somefolder\test_100m.wav'; %I'd recommend you use full path instead of relying on...

10 days ago | 1

| accepted

Answered

calculating the number of days within each month for a range of dates

You've got to learn to work with datetime arrays. There's no need to use datenum to construct datetimes, and adjusting the defau...

calculating the number of days within each month for a range of dates

You've got to learn to work with datetime arrays. There's no need to use datenum to construct datetimes, and adjusting the defau...

10 days ago | 0

| accepted

Answered

Transformation of the Matrix in a Loop

With your invented notation it's difficult to know what you actually have in matlab. Assuming you have a matrix such as: Z = [...

Transformation of the Matrix in a Loop

With your invented notation it's difficult to know what you actually have in matlab. Assuming you have a matrix such as: Z = [...

11 days ago | 1

| accepted

Answered

Old Matlab script not running on newer version

The equivalent of your wavwrite using audiowrite is: audiowrite(fullfile(subj_name, sprintf('%d.wav', block_num)), recordedaudi...

Old Matlab script not running on newer version

The equivalent of your wavwrite using audiowrite is: audiowrite(fullfile(subj_name, sprintf('%d.wav', block_num)), recordedaudi...

13 days ago | 1

| accepted

Answered

Merging matrices by comparison of values of several columns

Nearly right [~, whichArows, whichBrows] = intersect(out1(:, 2:4), out2(:, 2:4), 'rows'); C = [out2(whichBrows, 5), out1(which...

Merging matrices by comparison of values of several columns

Nearly right [~, whichArows, whichBrows] = intersect(out1(:, 2:4), out2(:, 2:4), 'rows'); C = [out2(whichBrows, 5), out1(which...

14 days ago | 0

| accepted

Answered

Using For Loop to get different outcomes

if ismember(psi_value, [0.05, 0.15, 0.25, 0.35]) %maybe use ismembertol s_plot = 0.8; else s_plot = 0.2; end Note ...

Using For Loop to get different outcomes

if ismember(psi_value, [0.05, 0.15, 0.25, 0.35]) %maybe use ismembertol s_plot = 0.8; else s_plot = 0.2; end Note ...

14 days ago | 0

Answered

Store a group of points (given x, y, and value) into image efficiently

img = zeros(1000, 1000); img(M(:, 2) + 1000 * (M(:, 1) - 1)) = M(:, 3);

Store a group of points (given x, y, and value) into image efficiently

img = zeros(1000, 1000); img(M(:, 2) + 1000 * (M(:, 1) - 1)) = M(:, 3);

14 days ago | 1

| accepted

Answered

Negative Value when using Trapz

Can someone tell me as to why this is the case Because your x vector is decreasing, so is negative for each trapeze a = trapz...

Negative Value when using Trapz

Can someone tell me as to why this is the case Because your x vector is decreasing, so is negative for each trapeze a = trapz...

15 days ago | 0

Answered

Create two arrays on the basis of other arrays

%first find which of A or B elements are going into. Only depends on V isA = false(size(V)); %put in A (true) or B (false) lA...

Create two arrays on the basis of other arrays

%first find which of A or B elements are going into. Only depends on V isA = false(size(V)); %put in A (true) or B (false) lA...

15 days ago | 0

| accepted