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# Alexandra Harkai

Active since 2016

Computer Scientist working in finance.
Likes cherries in graphs.

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How to fix: Index Exceeds Matrix Dimensions
P = 2 27 32 34 37 50 52 60 65 68 70 75 90 P+10 ans = 12 37 42...

mer än 5 år ago | 0

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How can I open the same program twice in matlab editor?
On the 'VIEW' tab the first section is 'TILES'. Select any of the options to view the same file in multiple sub-windows and edit...

mer än 5 år ago | 1

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Specific column range from an array?
y = x(5:10, 2) % rows 5:10, column 2 See more: <https://uk.mathworks.com/company/newsletters/articles/matrix-indexing-in-ma...

nästan 6 år ago | 3

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Subscript indices problem with a for loop
|Altitude| is |0| in the first loop, which is not a valid index in this case. It is suspicious though that you assign a numer...

nästan 6 år ago | 0

Convert 3D matrix in 2D data matrix
Hrow = squeeze(Hquest2(:,i,:));

nästan 6 år ago | 0

How to create a numerical variable from a string stored in a cell array ?
To get the numeric values: country_idx = findgroups(countrycode); For the second part, it really depends on what is it e...

nästan 6 år ago | 0

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How to operate on a specified parts of a matrix in a loop?
It would depend on the particular 'operation'. If your 'operation' works on a 10*50 matrix, and for example produces a scalar va...

nästan 6 år ago | 1

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Split Column into 3 Columns
If your 1181*4 matrix is |m|: res = [floor(m(:,1)/10000), floor(mod(m(:,1), 10000)/100), (m(:,1))]; Alternatively, you c...

nästan 6 år ago | 0

Convert cell array to numeric data
cellfun(@str2num, tt) will do the trick, |cellfun| applies |str2num| to every cell.

nästan 6 år ago | 2

how to fix the error "Undefined function or variable 'superpixels'." ?
This error is very self-explanatory: |superpixels| is not a variable that is defined for the scope, nor it is a function name th...

nästan 6 år ago | 0

Help in troubleshooting a code
|dec2hec| results in a char array of 1*n for each |(i,j)| pair, which then would not fit into one element of the numeric array |...

nästan 6 år ago | 0

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Undefined operator '==' for input arguments of type 'struct'.
It means |f| or |iregion| is a struct, and the |'=='| operator is not defined for that type. for structs, you can use |isequal| ...

nästan 6 år ago | 0

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how to save output of for loop
The size of output |S| in this case will be |54*20|. To specify that you want to assign |answer| to the whole row of |S|, use th...

nästan 6 år ago | 2

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a(a(a>3)<10) = OK ; a(a>3 && a<10) = wrong!, the correct way?
If you want to get only values between 3 and 10 (excluding the endpoints), the correct way would be: a(a>3 & a<10) (Not ...

nästan 6 år ago | 1

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How to save persistent variables after the last call to the function?
Without using the |save| command the |persistent| variables could be declared as persistent when calling from a function, as exp...

nästan 6 år ago | 0

Solved

Sum of diagonal of a square matrix
If x = [1 2 4; 3 4 5; 5 6 7] then y should be the sum of the diagonals of the matrix y = 1 + 4 + 7 = 12

nästan 6 år ago

Solved

Is my wife right?
Regardless of input, output the string 'yes'.

nästan 6 år ago

Solved

Is my wife right? Now with even more wrong husband
Again, as in "Is my wife right?" ( <http://www.mathworks.com/matlabcentral/cody/problems/149-is-my-wife-right> ), answer 'yes' r...

nästan 6 år ago

adding next values in an array
Considering the last element on a column will not be added to any other elements, you can loop through the whole thing: fun...

nästan 6 år ago | 0

About Preallocating for speed
NumberedOD = nchoosek(1:N, 2);

nästan 6 år ago | 3

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finding and changing values in matrix that satisfies 2 conditions
idx = find(A); % find indices of nonzero elements in A B = A; % initially set B to be same as A B(idx(2:2:end)) = 100;

nästan 6 år ago | 0

How to use IF statements for matrices correctly?
What MATLAB version are you using? Are you sure Example 4 gives a different result than Example 3? This works 'properly', as...

nästan 6 år ago | 1

How to convert binary elements of a cell into decimal number
Considering it's a 1*1624 numeric array you have in the cell |A|, you can utilise |bin2dec| to do it after converting the numeri...

nästan 6 år ago | 0

Setting a limit in an array
Given initial matrix |F|, this will floor entries at 30 in between z 'axis' (from and including) 40 and 50: F(:,:,40:50) = ...

nästan 6 år ago | 1

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How can I use a string input in a "for" loop to get a matrix of names?
The problem with this code is that (in MATLAB) indexing is from |1|, not |0|. Therefore |a(0)| is giving you the error. As fo...

ungefär 6 år ago | 1

Finding a maximum period
If you're looking for the |n| highest and lowest entry for each row of input |data|, you can still use the sort function: [...

ungefär 6 år ago | 0

multiply columns of an Array
bsxfun(@times, A, B) Or in R2016b: A * B

ungefär 6 år ago | 1

Finding NaN values in Structure
It is good practice to avoid |eval|: first_level = fieldnames(structure); counter = 0; % keep track of the found NaNs so...

ungefär 6 år ago | 0