Hi, I'm nobody.

I don't belong here, but I have nothing better to do.

Matlab used to be part of my work.

Now it's part of my hobbies.

That's pretty sad, really.

Answered

Three-dimensional lower triangular Matrix

Not sure if this is what you're asking, but: A = randi(89,10,10,2)+10; % test array mask = tril(ones(size(A,1),size(A,2))); % ...

Three-dimensional lower triangular Matrix

Not sure if this is what you're asking, but: A = randi(89,10,10,2)+10; % test array mask = tril(ones(size(A,1),size(A,2))); % ...

etwa 3 Stunden ago | 0

| accepted

Answered

Can someone suggest the best way to plot a directional 2D equilateral triangle?

This is incomplete, but it should be a start. r=10; % triangle radius p0=[0 0]; % prior point [x,y] p=[50 50]; % current po...

Can someone suggest the best way to plot a directional 2D equilateral triangle?

This is incomplete, but it should be a start. r=10; % triangle radius p0=[0 0]; % prior point [x,y] p=[50 50]; % current po...

etwa 4 Stunden ago | 0

Answered

I am wondering if this a no output no input function. If it is not what type of function is it?

It certainly doesn't have any input or output arguments, but reading the file with imread() is redundant if using that syntax wi...

I am wondering if this a no output no input function. If it is not what type of function is it?

It certainly doesn't have any input or output arguments, but reading the file with imread() is redundant if using that syntax wi...

etwa 6 Stunden ago | 0

Answered

Remove specific values from array

Something like this: A = [9,1,2,5,1,2,5,1,1,5,2,3,1,2,5,1,2,5,4,1,2,5,10] % input x = [1,2,5,9,10]; % values to keep B = A(is...

Remove specific values from array

Something like this: A = [9,1,2,5,1,2,5,1,1,5,2,3,1,2,5,1,2,5,4,1,2,5,10] % input x = [1,2,5,9,10]; % values to keep B = A(is...

etwa 10 Stunden ago | 0

Answered

How to make multiple execution of a code by loop ?

Well, since I don't know what the error message was, then I'll just guess it was this. T=readtable('Outputresults.txt') A=T(...

How to make multiple execution of a code by loop ?

Well, since I don't know what the error message was, then I'll just guess it was this. T=readtable('Outputresults.txt') A=T(...

ein Tag ago | 0

Answered

How to isolate object from a background of variable brightness

There are probably more robust methods, but here is my attempt: image=imread('worm.bmp'); im0 = imbinarize(255-rgb2gray(imag...

How to isolate object from a background of variable brightness

There are probably more robust methods, but here is my attempt: image=imread('worm.bmp'); im0 = imbinarize(255-rgb2gray(imag...

ein Tag ago | 2

| accepted

Answered

Calculating double integrals over a rectangular region without using built in function.

Your code looks like it should work. The problem is in your assumptions. The double integral over the given area calculates a ...

Calculating double integrals over a rectangular region without using built in function.

Your code looks like it should work. The problem is in your assumptions. The double integral over the given area calculates a ...

ein Tag ago | 0

Question

Can the figure toolbar be enabled for docked figures post-R2012b?

Prior to R2012b, docked figures had the regular figure toolbar, just like undocked figure windows. In later versions, there's j...

ein Tag ago | 0 answers | 0

Answered

How to create a vector in Matlab

For the first part: x=1:1/216:500; for the second part, what exactly do you need the spaces for? The extra spaces don't actua...

How to create a vector in Matlab

For the first part: x=1:1/216:500; for the second part, what exactly do you need the spaces for? The extra spaces don't actua...

ein Tag ago | 0

Answered

Index exceeds the number of array elements (8).

Your loop condition is while i <= length(Q) and the last thing that happens in the loop is i = i+1; so the moment the loop e...

Index exceeds the number of array elements (8).

Your loop condition is while i <= length(Q) and the last thing that happens in the loop is i = i+1; so the moment the loop e...

2 Tage ago | 1

Answered

how to get activation key of matlab r2015a

Have you tried this? https://www.mathworks.com/matlabcentral/answers/102845-where-can-i-find-the-activation-key-or-file-install...

how to get activation key of matlab r2015a

Have you tried this? https://www.mathworks.com/matlabcentral/answers/102845-where-can-i-find-the-activation-key-or-file-install...

2 Tage ago | 0

Answered

legend problem when plotting netcdf data

It's usually better to give legend the handles associated with the plots: h1=plot(x,thing1,'b'); hold on; h2=plot(x,thing2,'r'...

legend problem when plotting netcdf data

It's usually better to give legend the handles associated with the plots: h1=plot(x,thing1,'b'); hold on; h2=plot(x,thing2,'r'...

3 Tage ago | 0

Answered

why my plot is not correct?

I'm not sure what you intend the correct number to be. You're doing the cube root of negative numbers. They're going to be com...

why my plot is not correct?

I'm not sure what you intend the correct number to be. You're doing the cube root of negative numbers. They're going to be com...

3 Tage ago | 0

Answered

How can I take the value from an equation and plug it back into the same equation? (Newton-Raphson)

Something like this: function D = down(A, B, C, D, maxiter, tol) % things that are in the argument list don't get rewritten ...

How can I take the value from an equation and plug it back into the same equation? (Newton-Raphson)

Something like this: function D = down(A, B, C, D, maxiter, tol) % things that are in the argument list don't get rewritten ...

3 Tage ago | 0

| accepted

Answered

input window in matlab

The dialog is the least of the problems. In general: rep = uigetdir; Imgs = dir(rep); thisname = Imgs(3).name; [path,name,e...

input window in matlab

The dialog is the least of the problems. In general: rep = uigetdir; Imgs = dir(rep); thisname = Imgs(3).name; [path,name,e...

3 Tage ago | 0

| accepted

Answered

Adding feasible region on a Contour plot

Like I mentioned, it depends how you want to represent the region. Let's say you want to represent the feasibility region withi...

Adding feasible region on a Contour plot

Like I mentioned, it depends how you want to represent the region. Let's say you want to represent the feasibility region withi...

3 Tage ago | 0

| accepted

Answered

How can I fill the scratch after scratch detection?

Without knowing the original image content, you can probably do inpainting with regionfill() https://www.mathworks.com/help/ima...

How can I fill the scratch after scratch detection?

Without knowing the original image content, you can probably do inpainting with regionfill() https://www.mathworks.com/help/ima...

3 Tage ago | 0

| accepted

Answered

divide a matrix into small matrices

Something like this: A=randi(89,9)+10 % make an example array B=mat2cell(A,[3 3 3],[3 3 3]) % split the array into 9 arrays ...

divide a matrix into small matrices

Something like this: A=randi(89,9)+10 % make an example array B=mat2cell(A,[3 3 3],[3 3 3]) % split the array into 9 arrays ...

3 Tage ago | 0

| accepted

Answered

Dialog boxes to calculate functions

You'll get a numeric output from the menu call. Just do a switch-case structure, and calculate the answer using the correspondi...

Dialog boxes to calculate functions

You'll get a numeric output from the menu call. Just do a switch-case structure, and calculate the answer using the correspondi...

4 Tage ago | 0

Answered

how to convert sawtooth signal to a ramp signal

I imagine what you want is unwrap: t = linspace(0,3*2*pi,1000); raw = atan2(sin(t),cos(t)); unwrapped = unwrap(raw); plot(t,...

how to convert sawtooth signal to a ramp signal

I imagine what you want is unwrap: t = linspace(0,3*2*pi,1000); raw = atan2(sin(t),cos(t)); unwrapped = unwrap(raw); plot(t,...

4 Tage ago | 0

| accepted

Answered

newton raphson on matlab

I don't know why anyone would make you use x0=0 unless they wanted you to lose your hair. Think about where you are on the curv...

newton raphson on matlab

I don't know why anyone would make you use x0=0 unless they wanted you to lose your hair. Think about where you are on the curv...

4 Tage ago | 0

Answered

colormap including gray for out of range

You should be able to use colormapeditor to edit the current cmap or any of the presets. https://www.mathworks.com/help/matlab/...

colormap including gray for out of range

You should be able to use colormapeditor to edit the current cmap or any of the presets. https://www.mathworks.com/help/matlab/...

4 Tage ago | 0

Answered

what chroma subsampling does imwrite use for a jpg file, 4:4:4, 4:2:2, or something else?

I know this is an old question, but I just had to figure it out myself; I'm inclined to put answers where they belong. Imwrite ...

what chroma subsampling does imwrite use for a jpg file, 4:4:4, 4:2:2, or something else?

I know this is an old question, but I just had to figure it out myself; I'm inclined to put answers where they belong. Imwrite ...

4 Tage ago | 0

Answered

What chroma subsampling rate (e.g., 4:2:0 or 4:2:2) does imwrite use when saving a JPEG image?

I know this is an old question, but I just had to figure it out myself. Imwrite uses 4:2:0 chroma subsampling, and the default ...

What chroma subsampling rate (e.g., 4:2:0 or 4:2:2) does imwrite use when saving a JPEG image?

I know this is an old question, but I just had to figure it out myself. Imwrite uses 4:2:0 chroma subsampling, and the default ...

4 Tage ago | 0

Answered

How to Separate the RGB channels from an image and get the average of each RGB channel separetly

I'm feeling particularly lazy today, so I'm not going out of my way to make this solution avoid nonstandard tools. They could b...

How to Separate the RGB channels from an image and get the average of each RGB channel separetly

I'm feeling particularly lazy today, so I'm not going out of my way to make this solution avoid nonstandard tools. They could b...

4 Tage ago | 1

| accepted

Answered

Error Message: Array indices must be positive integers or logical values.

I'm not really sure what you're trying to do with the calculations, but this line: F(2*n:1+2*n) =+ Force(0); is going to resul...

Error Message: Array indices must be positive integers or logical values.

I'm not really sure what you're trying to do with the calculations, but this line: F(2*n:1+2*n) =+ Force(0); is going to resul...

4 Tage ago | 0

Answered

Combine Two .tiff Files into One Image

I'm not familiar with the registration and transformation tools, and I have a feeling that part of the problem is the fact that ...

Combine Two .tiff Files into One Image

I'm not familiar with the registration and transformation tools, and I have a feeling that part of the problem is the fact that ...

4 Tage ago | 1

| accepted

Answered

Cody Problem 25. Remove any row in which a NaN appears

Okay. Consider that isnan(A) returns a logical array, and that any() can work along a specified direction. B = A(~any(isnan(...

Cody Problem 25. Remove any row in which a NaN appears

Okay. Consider that isnan(A) returns a logical array, and that any() can work along a specified direction. B = A(~any(isnan(...

5 Tage ago | 1

| accepted

Answered

Warning: Integer operands are required for colon operator when used as index.

You need integers to do indexing operations. plot(f,Ak(1:floor((length(V2)+1)/2))); grid on

Warning: Integer operands are required for colon operator when used as index.

You need integers to do indexing operations. plot(f,Ak(1:floor((length(V2)+1)/2))); grid on

5 Tage ago | 0

Answered

Too many arguments error problem

Your function definition function Input_File(filename) specifies that this function takes one input argument and has zero out...

Too many arguments error problem

Your function definition function Input_File(filename) specifies that this function takes one input argument and has zero out...

5 Tage ago | 1

| accepted