Answered
What does "Line cannot be a child of line" mean?
semilogx is a command that plots values, it is not a transformation. The output is handle to a line object, not x-values that yo...
What does "Line cannot be a child of line" mean?
semilogx is a command that plots values, it is not a transformation. The output is handle to a line object, not x-values that yo...
9 years ago | 0
| accepted
Answered
the loop question for the for loop. k=1:n
Your code is very unclear. Learn to use arrays and matrices. Rather than b1 = 2 ; b2 = 4 ; b3 = ... y1 = [1 2 3] ; y2 = ...
the loop question for the for loop. k=1:n
Your code is very unclear. Learn to use arrays and matrices. Rather than b1 = 2 ; b2 = 4 ; b3 = ... y1 = [1 2 3] ; y2 = ...
9 years ago | 1
Answered
How to create a matrix of values from an if statement?
The statement [randi(10), randi(10)] will change every time, moving the prey randomly around the field. Set the position of the ...
How to create a matrix of values from an if statement?
The statement [randi(10), randi(10)] will change every time, moving the prey randomly around the field. Set the position of the ...
9 years ago | 0
Answered
How to print an array with same column starting locations?
Something like this? You can specify left alignment using the - sign fprintf([repmat('%-12.4f',1,size(A,2)) '\n'], A.') % n...
How to print an array with same column starting locations?
Something like this? You can specify left alignment using the - sign fprintf([repmat('%-12.4f',1,size(A,2)) '\n'], A.') % n...
9 years ago | 0
| accepted
Answered
call on rows in order from arrays of different sizes
My idea: # Convert A and B into cell arrays (each row becomes a cell) # Merge into a single cell array # Sort based on fir...
call on rows in order from arrays of different sizes
My idea: # Convert A and B into cell arrays (each row becomes a cell) # Merge into a single cell array # Sort based on fir...
9 years ago | 0
| accepted
Answered
Keeping rows of a matrix between two indicies.
I just want to point you to the following logic: if you start removing at the end, no indices will change: A(ix2:end,:) =...
Keeping rows of a matrix between two indicies.
I just want to point you to the following logic: if you start removing at the end, no indices will change: A(ix2:end,:) =...
9 years ago | 1
Answered
how can we randomly shuffle some columns of matrix in matlab?
Many options, here is a simple one using *randperm*: A = reshape(1:20,4,5) ; % example matrix c = [2 3] ; % columns to...
how can we randomly shuffle some columns of matrix in matlab?
Many options, here is a simple one using *randperm*: A = reshape(1:20,4,5) ; % example matrix c = [2 3] ; % columns to...
9 years ago | 1
Answered
how to apply 8x8 window to image of size 720x1280?
help blockproc (if you have the Image Processing Toolbox)
how to apply 8x8 window to image of size 720x1280?
help blockproc (if you have the Image Processing Toolbox)
9 years ago | 0
Answered
I have a (1600X1)matrix. I want to creat a 3D matrix of dimension 417x425x1600 using repetition of the one array of (1600x1). How can I do that?
Many tricky roads to Rome: % simple exemplary data A = [10 11 12 13] ; M = 3 ; N = 5 ; % B will be a M-by-N-by-...
I have a (1600X1)matrix. I want to creat a 3D matrix of dimension 417x425x1600 using repetition of the one array of (1600x1). How can I do that?
Many tricky roads to Rome: % simple exemplary data A = [10 11 12 13] ; M = 3 ; N = 5 ; % B will be a M-by-N-by-...
9 years ago | 0
Answered
How to map a value of a vector into column number of a matrix?
A fast and easy one-liner from the old days, when accumarray did not exist :) A = [2 ; 4 ; 5] B = full(sparse(A, 1:numel...
How to map a value of a vector into column number of a matrix?
A fast and easy one-liner from the old days, when accumarray did not exist :) A = [2 ; 4 ; 5] B = full(sparse(A, 1:numel...
9 years ago | 0
Answered
How to shuffle the image pixels using combined tent and sine map?
If A is your matrix [r,c] = find(A==V) will return the row(s) and column(s) where A matches the value V.
How to shuffle the image pixels using combined tent and sine map?
If A is your matrix [r,c] = find(A==V) will return the row(s) and column(s) where A matches the value V.
9 years ago | 0
| accepted
Answered
Divide a dataset into subsets
This is what you're after, I think. No need for a loop over each point in chanPOz N = numel(markers) ; % pre-allocate th...
Divide a dataset into subsets
This is what you're after, I think. No need for a loop over each point in chanPOz N = numel(markers) ; % pre-allocate th...
9 years ago | 0
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Answered
Assigning Multiple Vectors in a Structure Field
I think you're looking for this: for j=1:2 b(j).a = [1 0 0] ; % assign vector to field end which can be easier ...
Assigning Multiple Vectors in a Structure Field
I think you're looking for this: for j=1:2 b(j).a = [1 0 0] ; % assign vector to field end which can be easier ...
9 years ago | 0
Answered
Hi, I am new to Matlab, so please excuse the simplicity of this question. I have the (x,y) positions of a scatter plot. I would like matlab to fit multiple straight lines to my data. I need Matlab to determine optimal hinge points.
If you have access to the Signal Processing Toolbox, the function *findchangepts* might be useful <https://uk.mathworks.com/hel...
Hi, I am new to Matlab, so please excuse the simplicity of this question. I have the (x,y) positions of a scatter plot. I would like matlab to fit multiple straight lines to my data. I need Matlab to determine optimal hinge points.
If you have access to the Signal Processing Toolbox, the function *findchangepts* might be useful <https://uk.mathworks.com/hel...
9 years ago | 0
Answered
How to find the lowest and highest rows in a column vector which contain a value.
idx = ~isnan(A); lowestRow = find(idx, 1, 'first') highestRow = find(idx, 1, 'last')
How to find the lowest and highest rows in a column vector which contain a value.
idx = ~isnan(A); lowestRow = find(idx, 1, 'first') highestRow = find(idx, 1, 'last')
9 years ago | 1
Answered
how to multiply displayed xvalues on plot by constant
Here is one approach: % create plot x=-10:2:10 y = x.^2 plot(x,y,'bo-') % modify labels for tick marks...
how to multiply displayed xvalues on plot by constant
Here is one approach: % create plot x=-10:2:10 y = x.^2 plot(x,y,'bo-') % modify labels for tick marks...
9 years ago | 5
| accepted
Answered
The logic behind extracting the values in all corners of a 2-dimensional matrix
You might expect that A([r1 r2],[c1 c2]) returns only two elements, namely A(r1,c1) and A(r2,c2). As you now have seen,...
The logic behind extracting the values in all corners of a 2-dimensional matrix
You might expect that A([r1 r2],[c1 c2]) returns only two elements, namely A(r1,c1) and A(r2,c2). As you now have seen,...
9 years ago | 0
Answered
How to convert integer vector with the 1-of-K coding sheme into a matrix?
Here are two easy one-liners: Y = [2 2 1 3 2 4 1 4 4 3]; M1 = full(sparse(Y,1:10,1)) M2 = accumarray([Y(:) (1:10).'],...
How to convert integer vector with the 1-of-K coding sheme into a matrix?
Here are two easy one-liners: Y = [2 2 1 3 2 4 1 4 4 3]; M1 = full(sparse(Y,1:10,1)) M2 = accumarray([Y(:) (1:10).'],...
9 years ago | 1
Answered
Insert array into matrix within a loop
Just to make sure: X has 100 columns, You have a function that takes a column and returns a row-vector of 50 columns. And now yo...
Insert array into matrix within a loop
Just to make sure: X has 100 columns, You have a function that takes a column and returns a row-vector of 50 columns. And now yo...
9 years ago | 0
Question
How to check if output argument is ignored?
Is is possible to check if a function gets called with to-be-ignored output arguments (using ~)? function [Y1, Y2] = MyFunc...
9 years ago | 1 answer | 2
1
answerAnswered
How to make a structure from structures?
If A, B, etc. are similar structures you can simply concatenate them. An example % data A = struct('x', 1, 'y', 2) ...
How to make a structure from structures?
If A, B, etc. are similar structures you can simply concatenate them. An example % data A = struct('x', 1, 'y', 2) ...
9 years ago | 0
Answered
How to search a substring in a list of strings?
In recent releases you can use startsWith A = {'xx', 'abc1', 'abc2', 'yy', 'abc100'} tf = startsWith(A,'abc') B = A(t...
How to search a substring in a list of strings?
In recent releases you can use startsWith A = {'xx', 'abc1', 'abc2', 'yy', 'abc100'} tf = startsWith(A,'abc') B = A(t...
9 years ago | 1
Submitted
slidefun
apply function to a moving window over a vector (v5, jan 2018)
9 years ago | 6530 downloads |
Answered
Sliding window central value divided by window RMS
Maybe you can use my function SLIDEFUN which you can download from the File Exchange: <https://uk.mathworks.com/matlabcentral/f...
Sliding window central value divided by window RMS
Maybe you can use my function SLIDEFUN which you can download from the File Exchange: <https://uk.mathworks.com/matlabcentral/f...
9 years ago | 0
Answered
pi as a sum
My take would be to " _Write a matlab function_ ": function p = LeibnizPi(n) p = 0 ; for k = 1:n p = p + % fill...
pi as a sum
My take would be to " _Write a matlab function_ ": function p = LeibnizPi(n) p = 0 ; for k = 1:n p = p + % fill...
9 years ago | 0
Answered
How can I find the indices of the repeating elements in an array with respect to another array?
Here is a simple for-loop approach: a=[1,2,3,3,4,5,5,7,8,2] ; b=[1,2,3,3,2 2 2,4,5,5 999] ; % see my comments above ...
How can I find the indices of the repeating elements in an array with respect to another array?
Here is a simple for-loop approach: a=[1,2,3,3,4,5,5,7,8,2] ; b=[1,2,3,3,2 2 2,4,5,5 999] ; % see my comments above ...
9 years ago | 0
| accepted
Answered
Sub values into multiple rows and columns simutaneously
The words " _a few_" and " _others remaining zero_" might indicate that you also could use SPARSE matrices. For instance: A...
Sub values into multiple rows and columns simutaneously
The words " _a few_" and " _others remaining zero_" might indicate that you also could use SPARSE matrices. For instance: A...
9 years ago | 0
Submitted
rot3d90(A, X, K)
Rotate 3D array over 90 degrees in a particular plane
9 years ago | 144 downloads |
Answered
Good method to store pyramid shaped cell array?
If you have too many void cells in an array, you could consider a sparse encoding scheme, where you store the indices and the co...
Good method to store pyramid shaped cell array?
If you have too many void cells in an array, you could consider a sparse encoding scheme, where you store the indices and the co...
9 years ago | 1