Answered
NaN shows up in matrix when solving my ODEs, how can I fix this?
"All of my matrices I am solving for have NaN after the third time line. How do I solved this issue?" Set up a breakpoint somew...

4 years ago | 1

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Answered
Mean of multidimensional array
Doesn't mean(mdar,3) do what you want?

4 years ago | 0

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Answered
Function Error: Array indices must be positive integers or logical values.
When you have parentheses appear on the left hand side of an assignment like this: v(ro,ri) = (sqrt(m/(ri)))*((1/sqrt(R))-((sqr...

4 years ago | 1

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Answered
MXCREATEDOUBLEMATRIX memory overflow error
Rather later for an Answer, but here goes anyway: You should never use literal integers for API calls, because you can't be sur...

4 years ago | 0

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How can I solve x^4-1=0
doc roots

4 years ago | 0

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Convert unsigned integer to decimal
Not sure what the real question is here. Does one of these do what you want? int1 = uint32(hex2dec('9d900000')); int1 = uint32...

4 years ago | 0

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convert integer to bytes
Depending on what you are doing downstream with this, you can use the typecast( ) function. E.g., bytes = typecast(my_integer,'...

4 years ago | 1

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Answered
Selecting multiple different rows in a 3D matrix
You can use a vector for the indexing. E.g., x = matrix(:,:,[2:16,24:48]); Does that, or something like that, do what you wan...

4 years ago | 1

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Using a variable vector in a loop
Suppose you store the column vectors in a matrix called V. Then vk would simply be V(:,k). And if the uj are stored in a matrix...

4 years ago | 1

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Answered
Fortran code in Matlab
I'm trying to figure out the purpose of the backslash \. If this was the last character in the format statement then I would ass...

4 years ago | 0

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Assigning mxUint16 variable to plhs[0]
You cannot attach native C/C++ memory to an mxArray. The MATLAB API "mxSetEtc" functions check to see that the memory addresses ...

4 years ago | 0

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Answered
How to separate a vector into two different vectors?
Others have already pointed out better ways of doing this. But to answer your question as to why your current code is not workin...

4 years ago | 1

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Nested "For Loop" Array Size
To keep the indexing the same, just use the top value from the loops. E.g., DataArray = nan(300,50,100,numel(inputValsY3)); No...

4 years ago | 0

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Answered
convert value from radian form to degree form
If you have values, then just number_in_radians = number_in_degrees * (pi/180); If you are working with trig functions, note t...

4 years ago | 0

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Calculate taylor series using while loop
Looks like you are planning to use the identity ln(5) = ln((1/5)^-1) = -ln(1/5) and then use 1/5 as the x in the Taylor Series e...

4 years ago | 0

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How to multiply row of matrix A with column of matrix B?
Maybe this is what you want? C = sum(A .* B.',2)

4 years ago | 0

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Answered
Create variable with names of cell array
See this link: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-ev...

4 years ago | 0

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just started matlab just wondering how to set up a 'for' loop
Here is an outline to get you started: x = _____; nmax = _____; result = 0; for n=1:nmax result = result + _____; end ...

4 years ago | 0

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How can ı solve this triangle problem at MATLAB?
If you can find cos(x), you might look at feeding that into the acos( ) function to recover x.

4 years ago | 1

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Answered
interpolation for 4cos(x) − ex = 0
Without seeing the text of your assignment, I would presume that this is the outline of what you are supposed to do: 1) Define ...

4 years ago | 1

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Answered
Solving a large number (thousands) of different "Ax=b" equations when the matrices A are all the same small size (3x3 to 6x6), but different numbers.
See this FEX submission by Bruno Luong: https://www.mathworks.com/matlabcentral/fileexchange/24260-multiple-same-size-linear-so...

4 years ago | 0

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euler's method
Your code does not have enough states. You have a 2nd order ODE (the highest derivative present is 2), so the state vector need...

4 years ago | 1

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Sum of series in matlab
You could use a simple matrix multiply for this (it looks like the x is the first row and the y is the second row): A = R(1,1:2...

4 years ago | 0

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How does vrrotvec calculate rotation?
It is a simple algorithm that uses the cross product for the axis (normalized), and the dot product is used to calculate the ang...

4 years ago | 0

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Answered
How do I make a condition statement for an element that presents in two different arrays but is at the wrong position? This also applies to more than one elements
Assuming you have already made the check for the correct number in the correct spot, you can use this ismember(final_code_guess...

4 years ago | 0

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MATLAB determine if matrices are invertible or not
You can use rank( ) for this: https://www.mathworks.com/help/matlab/ref/rank.html?searchHighlight=rank&s_tid=srchtitle_rank_1 ...

4 years ago | 1

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Using Trapezodial rule Matlab
The trapezoid rule is for situations where you know the function values in advance, but you don't have this situation. I.e., if ...

4 years ago | 0

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fortran subroutine includes several other subroutines
Note that the timestwo.F example that comes with MATLAB is a bad example of Fortran code. It has several bugs in it that could l...

4 years ago | 3

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Call C/C++ Code from MATLAB Code
If your code includes a file called MyStruct.h, then yes you should have such a file. I would expect it to be something like th...

4 years ago | 0

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Matlab tries to use mex files not on search path
You should use debugging to find out why this is happening. Type the following at the command line: dbstop if error then run y...

4 years ago | 0

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