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How to find unique values in a matrix without looping over rows

M = randi([0,9],3,13) W = sort(M,2); W(diff(W,1,2)==0) = 0; W = sort(W,2) % optional

How to find unique values in a matrix without looping over rows

M = randi([0,9],3,13) W = sort(M,2); W(diff(W,1,2)==0) = 0; W = sort(W,2) % optional

alrededor de 12 horas ago | 0

Answered

Build matrix of different size column vectors generated inside a for loop

Inside the loop store the vectors in a preallocated cell array. Then after the loop use PADCAT (download required): https://www...

Build matrix of different size column vectors generated inside a for loop

Inside the loop store the vectors in a preallocated cell array. Then after the loop use PADCAT (download required): https://www...

alrededor de 16 horas ago | 0

Answered

How to extract numeric data between string lines?

str = fileread('02-2021-Clearance-Box005_fort72.txt'); rgx = '(?<=Number of hit cells:\s+\d+\s+)(\d+[^\n]*)'; tmp = regexp(str...

How to extract numeric data between string lines?

str = fileread('02-2021-Clearance-Box005_fort72.txt'); rgx = '(?<=Number of hit cells:\s+\d+\s+)(\d+[^\n]*)'; tmp = regexp(str...

alrededor de 21 horas ago | 0

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Answered

Replacing a numberless string in matrix with a number

Where V is that column: V = ["female";"male";"female";"male";"male";"female"] X = strcmpi(V,"female")

Replacing a numberless string in matrix with a number

Where V is that column: V = ["female";"male";"female";"male";"male";"female"] X = strcmpi(V,"female")

alrededor de 22 horas ago | 1

Answered

how to extract an extra variable which is calculated in ode function to main workspace?

Ignore advice that you should use assignin or evalin, because this does not take into account how ODE solvers work, as well as b...

how to extract an extra variable which is calculated in ode function to main workspace?

Ignore advice that you should use assignin or evalin, because this does not take into account how ODE solvers work, as well as b...

1 día ago | 0

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Answered

Why does ishghandle(0) alwys return true?

Because the graphics root always exists: https://www.mathworks.com/help/matlab/creating_plots/graphics-objects.html Using zero...

Why does ishghandle(0) alwys return true?

Because the graphics root always exists: https://www.mathworks.com/help/matlab/creating_plots/graphics-objects.html Using zero...

2 días ago | 1

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Answered

pick elements from a 3d array, based on an indexing matrix

https://www.mathworks.com/help/matlab/ref/sub2ind.html % fake data: nr = 5; nc = 7; np = 3; A = randi(9,nr,nc,np); I = ran...

pick elements from a 3d array, based on an indexing matrix

https://www.mathworks.com/help/matlab/ref/sub2ind.html % fake data: nr = 5; nc = 7; np = 3; A = randi(9,nr,nc,np); I = ran...

2 días ago | 0

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Answered

Loading data from structure, using variable

The most important step is to always load into an output variable (which itself is a scalar structure): S = load(...) % always ...

Loading data from structure, using variable

The most important step is to always load into an output variable (which itself is a scalar structure): S = load(...) % always ...

2 días ago | 2

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Answered

Sum per 2 elements in vector

A = [1;2;3;4;5;6]; B = A(1:2:end) + A(2:2:end) or more generally: B = sum(reshape(A,2,[]),1).' or B = reshape(A,2,[]).' * o...

Sum per 2 elements in vector

A = [1;2;3;4;5;6]; B = A(1:2:end) + A(2:2:end) or more generally: B = sum(reshape(A,2,[]),1).' or B = reshape(A,2,[]).' * o...

3 días ago | 1

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Answered

Problem outerjoin two tables 20x1 ; 20x8

I don't see why outerjoin is required: newTable = [ArrayTime,ArrayZ]

Problem outerjoin two tables 20x1 ; 20x8

I don't see why outerjoin is required: newTable = [ArrayTime,ArrayZ]

3 días ago | 0

Answered

Matlab round the values and find function can not give the exact result(index)?!

"I used this expression format longE to consider the actual values" format longE does not show the "actual values", it just sho...

Matlab round the values and find function can not give the exact result(index)?!

"I used this expression format longE to consider the actual values" format longE does not show the "actual values", it just sho...

3 días ago | 0

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Answered

Import data from bpmn file into one string/char value Matlab

The simple solution: https://www.mathworks.com/help/matlab/ref/fileread.html str = fileread(...);

Import data from bpmn file into one string/char value Matlab

The simple solution: https://www.mathworks.com/help/matlab/ref/fileread.html str = fileread(...);

3 días ago | 0

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Answered

Getting extra parameters from ODE45 and the mystery transpose

Using the OutputFcn is a complex way to get the Fs values. The simpler approach is to run the ODE solver normally, and then run...

Getting extra parameters from ODE45 and the mystery transpose

Using the OutputFcn is a complex way to get the Fs values. The simpler approach is to run the ODE solver normally, and then run...

3 días ago | 0

Answered

Normalizing RGB coordinates in an image

You did not take into account the integer class that you are using. Most likely the image data is uint8, which supports values ...

Normalizing RGB coordinates in an image

You did not take into account the integer class that you are using. Most likely the image data is uint8, which supports values ...

3 días ago | 0

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Answered

dynamically save a matrix to a structure

Do NOT use eval for trivial code like this. That approach is slow, complex, inefficient, and not recommended. Rather than messi...

dynamically save a matrix to a structure

Do NOT use eval for trivial code like this. That approach is slow, complex, inefficient, and not recommended. Rather than messi...

4 días ago | 0

Answered

Conditionally select from array of struct by membership of a list in struct element

X(1).Members = [1,2]; X(1).Name = 'Group 1'; X(2).Members = [2,3]; X(2).Name = 'Group 2'; F = @(n)arrayfun(@(s)any(s.Members...

Conditionally select from array of struct by membership of a list in struct element

X(1).Members = [1,2]; X(1).Name = 'Group 1'; X(2).Members = [2,3]; X(2).Name = 'Group 2'; F = @(n)arrayfun(@(s)any(s.Members...

6 días ago | 0

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Answered

Can I somehow improve performance of str2double?

The fastest conversion uses low-level commands, e.g. sprintf and sscanf. Instead of this: C = {'1.2','3.4','5.6'}; V = str2dou...

Can I somehow improve performance of str2double?

The fastest conversion uses low-level commands, e.g. sprintf and sscanf. Instead of this: C = {'1.2','3.4','5.6'}; V = str2dou...

6 días ago | 1

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Answered

How to sort one array based on the order of a second array?

As far as I can tell, the order of Q is irrelevant. A = ["1a","1b","1c","1d","1e","2a","2b","2c","2d","2e"]; % sorted B = ["A1...

How to sort one array based on the order of a second array?

As far as I can tell, the order of Q is irrelevant. A = ["1a","1b","1c","1d","1e","2a","2b","2c","2d","2e"]; % sorted B = ["A1...

6 días ago | 1

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Answered

Reshape array such that boundaries remain the same

x = [0, 1, 2, 1, 0]; y = [0, 0.5, 1, 1.5, 2, 1.5, 1, 0.5, 0]; xnew = interp1(x,linspace(1,numel(x),numel(y)))

Reshape array such that boundaries remain the same

x = [0, 1, 2, 1, 0]; y = [0, 0.5, 1, 1.5, 2, 1.5, 1, 0.5, 0]; xnew = interp1(x,linspace(1,numel(x),numel(y)))

6 días ago | 0

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Answered

Why am I getting "Array indices must be positive integers or logical values" error?

Consider this indexing: x1(i-j+1) What value does it have on the last iteration of the j loop? (hint: zero). i-j+1 % that ind...

Why am I getting "Array indices must be positive integers or logical values" error?

Consider this indexing: x1(i-j+1) What value does it have on the last iteration of the j loop? (hint: zero). i-j+1 % that ind...

6 días ago | 1

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Answered

Get unknown variable from mat-file

Given only one variable saved in the mat file: tmpC = struct2cell(load(filename)); myVar = tmpC{1}; Do not worry about the t...

Get unknown variable from mat-file

Given only one variable saved in the mat file: tmpC = struct2cell(load(filename)); myVar = tmpC{1}; Do not worry about the t...

7 días ago | 0

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Answered

Extracting the numbers from file names and listing them in a column

C = {'Rpma26siatBz 9.500000 Bx 0.000000mT WWait 2.000000Sec.Bzat9.5mT83.png',... 'Rpma26siatBz 9.500000 Bx 100.000000mT WW...

Extracting the numbers from file names and listing them in a column

C = {'Rpma26siatBz 9.500000 Bx 0.000000mT WWait 2.000000Sec.Bzat9.5mT83.png',... 'Rpma26siatBz 9.500000 Bx 100.000000mT WW...

7 días ago | 0

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Answered

sum contents of array in groups of 10

Where V is your 1x3001 vector: M = sum(reshape(V(1:3000),10,[]),1)

sum contents of array in groups of 10

Where V is your 1x3001 vector: M = sum(reshape(V(1:3000),10,[]),1)

7 días ago | 0

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Answered

How to append for each iteration not using cells?

Replace yield(p) = [yield(p); {helper(k)}]; with yield = [yield; helper(:)];

How to append for each iteration not using cells?

Replace yield(p) = [yield(p); {helper(k)}]; with yield = [yield; helper(:)];

7 días ago | 0

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Answered

How to solve preallocating speed of a variable?

One simple solution is given here: https://www.mathworks.com/help/matlab/matlab_oop/creating-object-arrays.html "To preallocat...

How to solve preallocating speed of a variable?

One simple solution is given here: https://www.mathworks.com/help/matlab/matlab_oop/creating-object-arrays.html "To preallocat...

7 días ago | 1

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Answered

Undefined function 'split' for input arguments of type 'char'

The function split was introduced in R2016b, so you will not be able to use it with R2013a. You can probably replace that line ...

Undefined function 'split' for input arguments of type 'char'

The function split was introduced in R2016b, so you will not be able to use it with R2013a. You can probably replace that line ...

7 días ago | 0

Answered

Accessing data from a struct cell

Assuming that your structure is named S, you can loop over it like this: for k = 1:numel(S) plot(S(k).data) % default plot...

Accessing data from a struct cell

Assuming that your structure is named S, you can loop over it like this: for k = 1:numel(S) plot(S(k).data) % default plot...

8 días ago | 0

Answered

Convert cell array to vector

S = load('timestamps.mat'); T = vertcat(S.ans{:}) M = seconds(mean(diff(duration(T,'InputFormat','hh:mm:ss.SSS'))))

Convert cell array to vector

S = load('timestamps.mat'); T = vertcat(S.ans{:}) M = seconds(mean(diff(duration(T,'InputFormat','hh:mm:ss.SSS'))))

8 días ago | 0

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Answered

Maximum number of repeated values over an array

a = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9]; x = cumsum([true;diff(...

Maximum number of repeated values over an array

a = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9]; x = cumsum([true;diff(...

8 días ago | 1

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