1,878 total contributions since 2014

Professional Interests: Signal Processing, OOP, Matlab GUI programming, Machine Learning

Answered

(Index in position 1 exceeds array bounds (must not exceed 1). error is popping up where it does not seem to apply

Well, I don't know about line 12, which (from counting - please indicate which is the line of the error message in future, it wo...

(Index in position 1 exceeds array bounds (must not exceed 1). error is popping up where it does not seem to apply

Well, I don't know about line 12, which (from counting - please indicate which is the line of the error message in future, it wo...

1 day ago | 0

Answered

Store only 4 value from a loop

If you have a nested loop like that you would generally want something like x(t,i) = ... with a 2d output to match the 2 neste...

Store only 4 value from a loop

If you have a nested loop like that you would generally want something like x(t,i) = ... with a 2d output to match the 2 neste...

2 days ago | 0

Answered

Detecting change in sign of values of a column

NewC = find( diff( sign( Data(:,2) ) ) ) + 1;

Detecting change in sign of values of a column

NewC = find( diff( sign( Data(:,2) ) ) ) + 1;

3 days ago | 1

| accepted

Answered

How to reshape a matrix into nx2 matrix?

reshape( A( :, [ 1:2:end, 2:2:end ] ), [], 2 ) You may wish to change the final two arguments to the reshape command in diffe...

How to reshape a matrix into nx2 matrix?

reshape( A( :, [ 1:2:end, 2:2:end ] ), [], 2 ) You may wish to change the final two arguments to the reshape command in diffe...

14 days ago | 0

| accepted

Answered

Unable to use a value of type cell as an index

You are passing in a variable called title to the second function. This will hide the function of the same name so that this in...

Unable to use a value of type cell as an index

You are passing in a variable called title to the second function. This will hide the function of the same name so that this in...

14 days ago | 1

| accepted

Answered

Assining fixed color for zero value

Define a colourmap of size n, assuming n is not huge, and then add black to the front of it n = 7; colourmap = [0 0 0; parula(...

Assining fixed color for zero value

Define a colourmap of size n, assuming n is not huge, and then add black to the front of it n = 7; colourmap = [0 0 0; parula(...

17 days ago | 0

| accepted

Answered

Any way to use British spellings for function calls and arguments?

https://blogs.mathworks.com/loren/2016/04/01/the-queens-matlab/ I took this seriously at first and was appalled! Not because I...

Any way to use British spellings for function calls and arguments?

https://blogs.mathworks.com/loren/2016/04/01/the-queens-matlab/ I took this seriously at first and was appalled! Not because I...

21 days ago | 2

Answered

Matlab data classes advantages

https://uk.mathworks.com/help/matlab/matlab_prog/fundamental-matlab-classes.html In basic terms obviously floating point (doubl...

Matlab data classes advantages

https://uk.mathworks.com/help/matlab/matlab_prog/fundamental-matlab-classes.html In basic terms obviously floating point (doubl...

22 days ago | 0

Answered

How to concatenate 2 cell arrays containing strings?

vertcat( x{:} )

How to concatenate 2 cell arrays containing strings?

vertcat( x{:} )

22 days ago | 0

| accepted

Answered

Why do I need to declare a variable inside a nested 'for' loop?

You are referring to it on the right-hand side of the equation as well as on the left. First time round it does not exist yet s...

Why do I need to declare a variable inside a nested 'for' loop?

You are referring to it on the right-hand side of the equation as well as on the left. First time round it does not exist yet s...

24 days ago | 1

| accepted

Answered

signal processing (segmentation in time domain)

sig1 = sig( t >= 0.34 && t <= 4 ); sig2 = sig( t >= 6 && t <= 8.5 ); If you also need the t vector then apply it similarly. J...

signal processing (segmentation in time domain)

sig1 = sig( t >= 0.34 && t <= 4 ); sig2 = sig( t >= 6 && t <= 8.5 ); If you also need the t vector then apply it similarly. J...

24 days ago | 0

Answered

finding inverse exponential value

If i and j are pixel values then you must have an image to which they are applied, e.g. im, in which case simply exp( -im(i,j) ...

finding inverse exponential value

If i and j are pixel values then you must have an image to which they are applied, e.g. im, in which case simply exp( -im(i,j) ...

24 days ago | 0

Answered

Reference to non-existent field error

exist('handles.mystructdata') does not work for struct fields. isfield( handles, 'mystructdata' ) is what you should use to c...

Reference to non-existent field error

exist('handles.mystructdata') does not work for struct fields. isfield( handles, 'mystructdata' ) is what you should use to c...

28 days ago | 1

| accepted

Answered

How to replace values of certain rows in a matrix?

a( [2 3], : ) = repmat( b, 2, 1 ) A bit more generally: indicesToReplace = [2 3]; a( [2 3], : ) = repmat( b, indicesToReplace...

How to replace values of certain rows in a matrix?

a( [2 3], : ) = repmat( b, 2, 1 ) A bit more generally: indicesToReplace = [2 3]; a( [2 3], : ) = repmat( b, indicesToReplace...

28 days ago | 0

Answered

FFT step by step help

The lpad part is a little suspicious. If you have an odd length of signal it will not work as is. Apart from that though: xdf...

FFT step by step help

The lpad part is a little suspicious. If you have an odd length of signal it will not work as is. Apart from that though: xdf...

29 days ago | 1

| accepted

Answered

Index exceeds the number of array elements

[A, index] = unique (A); replaces what was in A with the result of unique (i.e. all the non-unique values removed) So indexing...

Index exceeds the number of array elements

[A, index] = unique (A); replaces what was in A with the result of unique (i.e. all the non-unique values removed) So indexing...

29 days ago | 0

Answered

Get position when using uicontextmenu

I use code like this to position my context menu under the cursor on an axes, though if you already have the figure handle at th...

Get position when using uicontextmenu

I use code like this to position my context menu under the cursor on an axes, though if you already have the figure handle at th...

1 month ago | 0

Answered

replace duplicate value by 0 in matrix or vector

[C,ia] = unique( b ); b( setdiff( 1:numel(b), ia ) ) = 0;

replace duplicate value by 0 in matrix or vector

[C,ia] = unique( b ); b( setdiff( 1:numel(b), ia ) ) = 0;

1 month ago | 1

Answered

Unrecognized function or variable 'axes34_CreateFcn'.

Unless you have explicitly created one axes don't have a createFcn set by default, so I assume you must have asked it to create ...

Unrecognized function or variable 'axes34_CreateFcn'.

Unless you have explicitly created one axes don't have a createFcn set by default, so I assume you must have asked it to create ...

1 month ago | 0

Answered

disp function error in matlab coder

disp is not supported by Coder. sprintf should work though.

disp function error in matlab coder

disp is not supported by Coder. sprintf should work though.

1 month ago | 0

Answered

How to create empty matrix in matlab?

myMatrix = cell( 10 ); would create a 10x10 cell array. If all your images are the same size though you'd be better off with t...

How to create empty matrix in matlab?

myMatrix = cell( 10 ); would create a 10x10 cell array. If all your images are the same size though you'd be better off with t...

1 month ago | 0

Answered

How can I display a specific frame in my image series ?

image10 = allImages( :, :, 10 ); images2_5 = double( allImages( :, : [2 5] ) ); image2_minusImage5 = diff( images2_5, [], 3 );...

How can I display a specific frame in my image series ?

image10 = allImages( :, :, 10 ); images2_5 = double( allImages( :, : [2 5] ) ); image2_minusImage5 = diff( images2_5, [], 3 );...

1 month ago | 0

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Answered

extract logical locations that match array

B .* A would seem to give what you want

extract logical locations that match array

B .* A would seem to give what you want

1 month ago | 0

| accepted

Answered

how to select the desired range of each dimension from the 3d array?

new_precipitation = precipitation( 1400:1439, 500:519, 700:900 ) would create what you ask for though it will be 1 bigger in ea...

how to select the desired range of each dimension from the 3d array?

new_precipitation = precipitation( 1400:1439, 500:519, 700:900 ) would create what you ask for though it will be 1 bigger in ea...

1 month ago | 0

| accepted

Answered

Convert Z dimension to X dimension

myArray(:) will do for that kind of reshape, where myArray is obviously the array you start with.

Convert Z dimension to X dimension

myArray(:) will do for that kind of reshape, where myArray is obviously the array you start with.

2 months ago | 0

| accepted

Answered

Initial centroids selection - Kmeans

doc kmeans shows the idx = kmeans(X,k,Name,Value) function signature. If you look at the options for 'Name', 'Value' pairs y...

Initial centroids selection - Kmeans

doc kmeans shows the idx = kmeans(X,k,Name,Value) function signature. If you look at the options for 'Name', 'Value' pairs y...

2 months ago | 0

| accepted

Answered

MATLAB Answers Wish-list #5 (and bug reports)

Has there been any further thought on changing what is considered a compulsory field for users asking a question? Title, body a...

MATLAB Answers Wish-list #5 (and bug reports)

Has there been any further thought on changing what is considered a compulsory field for users asking a question? Title, body a...

2 months ago | 2

Answered

How to define range using a variable in xlsread?

doc sprintf can create a string out of variables, e.g. columnStr = 'B'; startRow = 50; endRow = 50; sprintf( '%s%i:EHI%i', ...

How to define range using a variable in xlsread?

doc sprintf can create a string out of variables, e.g. columnStr = 'B'; startRow = 50; endRow = 50; sprintf( '%s%i:EHI%i', ...

2 months ago | 0

| accepted

Answered

SOM codebook vectors output

net.IW{1} will give you the codebook vectors/weights. For example: x = simplecluster_dataset; net = selforgmap([8 8]); net ...

SOM codebook vectors output

net.IW{1} will give you the codebook vectors/weights. For example: x = simplecluster_dataset; net = selforgmap([8 8]); net ...

2 months ago | 0

Answered

How to automatically put the asked values in function by script?

You would have to define a function that takes two arguments (or an array of inputs to add), e.g. for an example of a fixed two ...

How to automatically put the asked values in function by script?

You would have to define a function that takes two arguments (or an array of inputs to add), e.g. for an example of a fixed two ...

2 months ago | 0