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James Tursa


3,073 total contributions since 2007

Interested in external applications, mex & engine applications with Fortran, C, C++, etc, particularly in the areas of speed improvement and memory management efficiencies.

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Answered
How can we create a vector of length n
There are many ways of doing this. E.g., use the ones( ) function and divide by 10. Or use the zeros( ) function and add 1/10....

8 hours ago | 0

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Answered
Index Exceeds Matrix Dimensions
You have inadvertantly created variables named "dot" and "cross" that are shadowing the MATLAB functions of the same names. Cha...

11 hours ago | 0

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Saving all outputs of for for-loop
Basic steps for you to take would be: Create your range up front, and not as part of the loop indexing. E.g., a t vector Use t...

12 hours ago | 0

Answered
Create matrix indicating combinations of dummy variables
Variations of this technique are often used, but this can exceed your memory if n gets too large: n = 8; result = dec2bin(0:2^...

12 hours ago | 0

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Answered
Solve the limit limx→0
Hint: If you are just looking to get an answer, consider looking at the Taylor Series of each individual term and then ask yours...

14 hours ago | 0

Answered
Filling a matrix without for-loops and ifs
Check out the sub2ind( ) function: https://www.mathworks.com/help/matlab/ref/sub2ind.html?searchHighlight=sub2ind&s_tid=doc_src...

15 hours ago | 0

Answered
Vectorizing evaluation of cell array of functions
Not sure this will be any faster since the loop is just hidden, but you can try this: output = arrayfun(@(x,y)x{1}(y),funcell,i...

15 hours ago | 1

Answered
Wondering if you have any merchandise for sale cause I'd love to look like a part of the MATLAB team 😀
How about a MATLAB/Simulink Rubik's Cube? https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=matlab+rubiks&_saca...

15 hours ago | 0

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Is there a matlab function similar to numpy.spacing
From the numpy.spacing doc: "It can be considered as a generalization of EPS ... there should not be any representable number ...

1 day ago | 3

Answered
What is the best way to insure that all of my functions are using the same constant values?
I use a function that returns a structure, containing the values and the unit descriptions. Your code can either pass this stru...

1 day ago | 3

Answered
Separate out every fourth element of a Vector
V = your vector result = V; result(4:4:end) = []; % remove every 4th element The above syntax with [] on the rhs is special ...

6 days ago | 0

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Answered
How to extract the value of dydt from ode45 function
Why can't you just call your odefcn( ) function with your solution t and xSol vector elements as inputs (e.g., in a loop)? Does...

6 days ago | 1

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Answered
How to make an assignment for my for loop?
This syntax with the curly braces next to SBOS means it is a cell array: SBOB{ whatever } But this syntax with the dot notatio...

6 days ago | 1

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Answered
Write binary file in Matlab
Can you read and write as “STREAM” in your FORTRAN compiler? No header stuff to worry about.

7 days ago | 0

Answered
how binary floating point to real decimal number representation ?
You can't use dec2bin( ) reliably for this conversion in all versions of MATLAB because it is limited by flintmax (see note at b...

7 days ago | 0

Answered
Binary floating point Representation in Matlab
Did you try it? >> A=[ 0.1900 -0.0300 -0.1300 0 0.1500 -0.0700 0.0500 0.1600 -0.2500 -0.1900]; >> dec2bin(typecast(A,'uint...

7 days ago | 0

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Answered
Find sum of elements in a cell along the columns
Is this what you are trying to do? (using the curly braces) y = sum([A{2,:,1}])

10 days ago | 0

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Answered
Can somebody explain me this answer?
You are using linear indexing into "a". This matrix: >> 3*ones(2) ans = 3 3 3 3 When used as indexing, i...

10 days ago | 1

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Using 3D array to subtract row Q from row P
It is unclear what you really want. If you want the Euclidean distance squared between rows, e.g., rows 1 and 3, then just d =...

12 days ago | 0

Answered
How to change radians into degrees?
Why are you using sym to find the angle? Just use atand( ) directly with the appropriate input. That seems to be the intent of...

13 days ago | 0

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I assign A = B; but I could not use A and B interchangeably
You are changing I_fted inside the loop. If you subsequently use it in another calculation within the loop, it would not be surp...

14 days ago | 1

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Answered
matrix dimension reshape error
To solve your sizing issues, type the following into MATLAB: dbstop if error Then run your code. When the error occurs, your c...

14 days ago | 0

Answered
Is it possible to 'clear all' variables except one?
Another method is the FEX keep utility: https://www.mathworks.com/matlabcentral/fileexchange/181-keep

14 days ago | 0

Answered
MKL 2018 supposedly supports integer matrix multiplication. Can this feature be added to Matlab?
The main problem with matrix multiplication on integer types (int32, etc.) in MATLAB is that the operation result is ambiguous i...

16 days ago | 0

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Convert 0×1 empty double column vector to zero
Is this construct all you need? if( isempty(x) ) x = 0; end

20 days ago | 0

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Answered
How to use randperm with minimum spacing between random numbers
Maybe something like this will suffice for your needs? p = b * randperm(floor(n/b),k) If n/b isn't an integer value, then ther...

20 days ago | 0

Answered
How do you append to a matrix within a for loop when the matrices are unequal in size?
Maybe you could use a cell array. E.g., : D1 = cell(1,N); for a=1:N : D1{a} = C; end Then the first matrix...

21 days ago | 1

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Answered
What is the best way to save to .csv without losing precision and with column headers?
Why are you using fprintf in a loop? Can't you do it all in one call? E.g., this for i = 1:length(x) fprintf(fid,'%f , %...

22 days ago | 0

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Answered
Error: Too many output arguments.
Your function isn't coded to return anything. Try this: function timber_length = GET_NEAREST_LENGTH(length) Btw, "length" is t...

23 days ago | 0

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Answered
write a function to translate a 3d object
You didn't write your function to return an output. Try this: function S = shift(S,dist,axis)

23 days ago | 1

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