Answered

Why fwrite is ~320x slower in the second interation and onwards when writing interleaved data?

I would suspect the reason for the much slower writes in iteration 2 and onward is that for the first iteration, since the file ...

Why fwrite is ~320x slower in the second interation and onwards when writing interleaved data?

I would suspect the reason for the much slower writes in iteration 2 and onward is that for the first iteration, since the file ...

9 hours ago | 1

Answered

Organising data from a matrix

selectedvalue = 4; filteredmatrix = yourmatrix(yourmatrix(:, 1) == selectedvalue, :)

Organising data from a matrix

selectedvalue = 4; filteredmatrix = yourmatrix(yourmatrix(:, 1) == selectedvalue, :)

10 hours ago | 0

| accepted

Answered

how can I read a file with the format '.cine'?

If you are talking about the video format produced by VisionResearch Phantom cameras, then they can provide you with some matlab...

how can I read a file with the format '.cine'?

If you are talking about the video format produced by VisionResearch Phantom cameras, then they can provide you with some matlab...

11 hours ago | 0

Answered

Isolating and running a piece of code separately from the rest

A complete guess, if you want to split A into groups that start when B is 0 and apply unwrap to each group: group = cumsum(B ==...

Isolating and running a piece of code separately from the rest

A complete guess, if you want to split A into groups that start when B is 0 and apply unwrap to each group: group = cumsum(B ==...

1 day ago | 0

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Answered

How can I make a vector divide 1 by increasing numbers?

v = 1 ./ (1:10)

How can I make a vector divide 1 by increasing numbers?

v = 1 ./ (1:10)

1 day ago | 1

| accepted

Answered

convert numbers that contain the scientific notation e to the long format then round it to the fourth decimal?

I assume that what you mean is that you'd like matlab to display numbers as -0.0003 instead of 3e-4. If so, format shortg will...

convert numbers that contain the scientific notation e to the long format then round it to the fourth decimal?

I assume that what you mean is that you'd like matlab to display numbers as -0.0003 instead of 3e-4. If so, format shortg will...

1 day ago | 0

Answered

How to find array elements that meet a condition defined by an index vector?

It's not clear to me why L is a matrix of integers when the only value you care about is 5. Shouldn't it be a binary matrix? We...

How to find array elements that meet a condition defined by an index vector?

It's not clear to me why L is a matrix of integers when the only value you care about is 5. Shouldn't it be a binary matrix? We...

1 day ago | 0

| accepted

Answered

Cannot read data from a table to create a graph

The problem is that your timestamp column is text and matlab does not know how to use text as a plot variable. I assume that th...

Cannot read data from a table to create a graph

The problem is that your timestamp column is text and matlab does not know how to use text as a plot variable. I assume that th...

1 day ago | 0

| accepted

Answered

how to preallocate a variables

Again, with the code you show, there's nothing that can be preallocated. But your loops are also not very useful since the overw...

how to preallocate a variables

Again, with the code you show, there's nothing that can be preallocated. But your loops are also not very useful since the overw...

1 day ago | 0

Answered

Matlab doesnt recognize file in path while using readObj

sarl = readobj(something) Pass the content of the variable called something to the function readobj. If readobj expects a filen...

Matlab doesnt recognize file in path while using readObj

sarl = readobj(something) Pass the content of the variable called something to the function readobj. If readobj expects a filen...

2 days ago | 1

Answered

64 bit binary number representation in matlab without rounding off

If matlab shows the number is 1.01010101010101e+41 then you do not have a binary number. You have a decimal integer number consi...

64 bit binary number representation in matlab without rounding off

If matlab shows the number is 1.01010101010101e+41 then you do not have a binary number. You have a decimal integer number consi...

2 days ago | 2

Answered

JSON decode / encode eats arrays

Not sure why Walter revived this old question but now that I've seen it: For the record, while inconvenient in the above scenari...

JSON decode / encode eats arrays

Not sure why Walter revived this old question but now that I've seen it: For the record, while inconvenient in the above scenari...

3 days ago | 0

Answered

Extracting Data from Cells

If you want to create a scatter3 plot using the coordinates from all the cells of Cross_sections, this is how I'd go about it: ...

Extracting Data from Cells

If you want to create a scatter3 plot using the coordinates from all the cells of Cross_sections, this is how I'd go about it: ...

3 days ago | 0

Answered

problem with "cd" and network drive

cd filepath is the command form of cd. The fact that filepath is purple is a hint that filepath is being treated as literal tex...

problem with "cd" and network drive

cd filepath is the command form of cd. The fact that filepath is purple is a hint that filepath is being treated as literal tex...

3 days ago | 1

| accepted

Answered

Time series plot from structure array

but for the original data set tickers will have different number of dates so it will not be possible to put them in a table (I t...

Time series plot from structure array

but for the original data set tickers will have different number of dates so it will not be possible to put them in a table (I t...

3 days ago | 0

| accepted

Answered

Using for loops in referencing

You don't even need a loop to perform your calculation: n = permute(0:5:40, [1, 3, 2]); %create a vector 0:5:40 in the 3rd dime...

Using for loops in referencing

You don't even need a loop to perform your calculation: n = permute(0:5:40, [1, 3, 2]); %create a vector 0:5:40 in the 3rd dime...

3 days ago | 1

| accepted

Answered

ActiveX compatibility problems in Matlab GUIDE application

Since you want to use your activex program in GUIDE, I assume it is an activeX control. If so, it is impossible to use a 32-bit ...

ActiveX compatibility problems in Matlab GUIDE application

Since you want to use your activex program in GUIDE, I assume it is an activeX control. If so, it is impossible to use a 32-bit ...

4 days ago | 0

| accepted

Answered

Naming sheets with xlswrite

Have you looked at the documentation of xlswrite? xlswrite(filename,A,sheet) writes to the specified worksheet.

Naming sheets with xlswrite

Have you looked at the documentation of xlswrite? xlswrite(filename,A,sheet) writes to the specified worksheet.

4 days ago | 0

| accepted

Answered

What licence do I need to sell MATLAB/Simulink Online Course?

I would persevere with Sales. It's odd that they're not answering you. We don't work for Mathworks so whatever we tell you has n...

What licence do I need to sell MATLAB/Simulink Online Course?

I would persevere with Sales. It's odd that they're not answering you. We don't work for Mathworks so whatever we tell you has n...

4 days ago | 0

| accepted

Answered

Empty Figures because of empty variables

Right, since we're not getting the required explanation of what you're trying to do, here is how to calculate monthly latitude a...

Empty Figures because of empty variables

Right, since we're not getting the required explanation of what you're trying to do, here is how to calculate monthly latitude a...

4 days ago | 0

Answered

Community profile not updating

Yes, I've reported it to the devs half an hour ago. No reply so far, but it's still early at Mathworks.

Community profile not updating

Yes, I've reported it to the devs half an hour ago. No reply so far, but it's still early at Mathworks.

4 days ago | 1

| accepted

Answered

Save Excel cell range as image with activeX

With activex, you can do anything you can do with excel directly (as long as excel exposes it programmatically). So if you know ...

Save Excel cell range as image with activeX

With activex, you can do anything you can do with excel directly (as long as excel exposes it programmatically). So if you know ...

5 days ago | 2

| accepted

Answered

How to update variable names after a "clear"

Unfortunately, this is a limitation of matlab's editor. Note that clear x is exactly the same as clear('x') The former is t...

How to update variable names after a "clear"

Unfortunately, this is a limitation of matlab's editor. Note that clear x is exactly the same as clear('x') The former is t...

5 days ago | 0

| accepted

Answered

how I can delete 1.0e+03 in my answer

format shortg %or format longg should fix your display issue.

how I can delete 1.0e+03 in my answer

format shortg %or format longg should fix your display issue.

6 days ago | 1

Answered

In memory calculations with tall arrays from different databases

If you have R2019a, you can combine your two datastores. ds_1 = tabularTextDatastore('file_1.txt'); ds_2 = tabularTextDatastor...

In memory calculations with tall arrays from different databases

If you have R2019a, you can combine your two datastores. ds_1 = tabularTextDatastore('file_1.txt'); ds_2 = tabularTextDatastor...

6 days ago | 1

Answered

Removing data from a structure that is less than a certain threshold

This code seems to run very slowly The code you've posted either doesn' do anything because the if condition is never true, or ...

Removing data from a structure that is less than a certain threshold

This code seems to run very slowly The code you've posted either doesn' do anything because the if condition is never true, or ...

6 days ago | 1

Answered

What will be the output of of CD(1:8:8*16)=ciphertext

It simply replaces elements 1,9,17, 25, ..., 121 of CD by the elements of ciphertext. Since that's 16 elements of CD that are re...

What will be the output of of CD(1:8:8*16)=ciphertext

It simply replaces elements 1,9,17, 25, ..., 121 of CD by the elements of ciphertext. Since that's 16 elements of CD that are re...

7 days ago | 1

| accepted

Answered

How to run macro in a different workbook

If the macro is supposed to act on the first workbook, the only way your excel procedure can work is if the macro rely on the Ac...

How to run macro in a different workbook

If the macro is supposed to act on the first workbook, the only way your excel procedure can work is if the macro rely on the Ac...

7 days ago | 2

| accepted

Answered

Sort Through Cell And Put Corresponding Values In Their Respective Rows

This is how I'd do it: data = readtable('ML_Q_1.xlsx', 'ReadVariableNames', false); %optionally, give better name to the varia...

Sort Through Cell And Put Corresponding Values In Their Respective Rows

This is how I'd do it: data = readtable('ML_Q_1.xlsx', 'ReadVariableNames', false); %optionally, give better name to the varia...

7 days ago | 1

| accepted

Answered

How to split a table based on date and hour

The easiest way is to use retime (requires a timetable) or groupsummary grouping by day, Of course, for matlab a day starts at 0...

How to split a table based on date and hour

The easiest way is to use retime (requires a timetable) or groupsummary grouping by day, Of course, for matlab a day starts at 0...

7 days ago | 2

| accepted