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James Tursa


3,081 2007 年以降の合計貢献数

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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Kindly give me the Matlab code for simplex method?
Use the MATLAB supplied function fminsearch.

約4時間 前 | 0

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Error when calling the mexFunction
You probably should have gotten a warning from the compiler that your callFun( ) function doesn't return anything, even though t...

約8時間 前 | 0

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How to turn assigned vectors into a 3x3 matrix?
Assuming vec3 is a typo, result = [vec1;vec2;vec3]; If you need to, you can transpose the result. If your vec3 is not a typo,...

約23時間 前 | 0

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[Create mexfunction from C code] The order of several c files
The order you compile your source code files should not matter. The error seems to be that the compiler can't find the resource...

1日 前 | 0

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When I try to run a function in matlab, I get an error, it is undefined
Put this code in a file called checkEchelonMatrix.m that is on the MATLAB path: function [result] = checkEchelonMatrix(M) %res...

1日 前 | 0

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Memory erased in mex file
I would highly advise combining your multiple mex routines into one mex routine that you call with a directive (e.g., a string) ...

1日 前 | 0

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Sort Index - Bug
The sort index gives the location in the original array of the sorted values. I.e., the sort results "a" are "original_array(sor...

1日 前 | 1

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[Create mexfunction from C code] warning: implicit declaration of function
You call myfunction( ) before the compiler has seen a prototype or definition of myfunction( ). Either move your square( ) and ...

1日 前 | 0

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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....

2日 前 | 0

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

2日 前 | 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...

2日 前 | 0

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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^...

2日 前 | 0

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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...

2日 前 | 0

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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...

2日 前 | 0

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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...

2日 前 | 1

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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...

2日 前 | 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 ...

3日 前 | 3

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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...

3日 前 | 3

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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 ...

7日 前 | 0

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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...

7日 前 | 1

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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...

7日 前 | 1

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

8日 前 | 0

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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...

8日 前 | 0

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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...

8日 前 | 0

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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}])

11日 前 | 0

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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...

11日 前 | 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 =...

13日 前 | 0

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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...

15日 前 | 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...

15日 前 | 1

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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...

15日 前 | 0

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