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Writing a funciton for e^x values?
You use the same n value for the first three terms. You need to increment n each time you add a term, including the first two t...

presque 7 ans il y a | 0

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Trying to write a function for the inverse of a matrix.
You are missing the part where you append the identity matrix to the right side of A before you start your Gauss elimination. So...

presque 7 ans il y a | 0

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mex fortran code containing intrinsic function using Intel fortran compiler
Can you post the offending code? Maybe you are calling it with a non-real argument and the compiler is complaining that it can't...

presque 7 ans il y a | 0

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How to re-prompt user input if given incorrect value?
str2double will turn your inputs into numeric, so you will pass your isnumeric( ) test even if there are problems. Instead, chec...

presque 7 ans il y a | 0

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Can not use the Fibonacci built in function
For simplicity, let's assume you don't know how many iterations you need in advance. So start with your current code: while x <...

presque 7 ans il y a | 0

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Trapezoidal rule in a for loop
You made a good start, but there are several problems with your summation. You don't accumulate into your trapez variable, you ...

presque 7 ans il y a | 0

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Why is my own echelon function printing incorrect matrix
I haven't checked all of your code, but I assume this: if ~all(A(k,:))==0 %check to see if row of zeros or not was meant to be...

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(1/x)>2 . why x<(1/2) is Not the answer
When you multiply (or divide) an inequality by a value, the direction of the inequality changes if the value is negative. So whe...

presque 7 ans il y a | 0

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How to compare element between two numbers
Like Rik, I am not sure what comparison you are doing based on your terse description. Maybe this, but it doesn't match your st...

presque 7 ans il y a | 0

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[mexFunction in Matlab] printf() function in C code
How you have it written should work, except maybe replace printf( ) with mexPrintf( ). Also, depending on your compiler and sett...

presque 7 ans il y a | 0

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How to return the outputs of mexFunction() in Matlab?
Put this at the bottom of your code. But remember that if you call mexErrMsgTxt your mex function will exit immediately and not ...

presque 7 ans il y a | 1

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Error: Matrix dimensions must agree
You could use V(2:end) or V(1:end-1) instead of V in that line. Or maybe average the two.

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Write a MATLAB code to estimate the exponential function. Inputs should be x and n. The outputs must include approximate value, true value, error, absolute error, and relative error.
Put your function code for e_to_x() in a separate file called e_to_x.m somewhere on the MATLAB path. Then put your other code t...

presque 7 ans il y a | 0

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

presque 7 ans il y a | 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...

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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,...

presque 7 ans il y a | 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 (other than the fact that the mex function name will be based on ...

presque 7 ans il y a | 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...

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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) ...

presque 7 ans il y a | 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...

presque 7 ans il y a | 2

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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 ...

presque 7 ans il y a | 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...

presque 7 ans il y a | 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...

presque 7 ans il y a | 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....

presque 7 ans il y a | 1

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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^...

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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...

presque 7 ans il y a | 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...

presque 7 ans il y a | 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...

presque 7 ans il y a | 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...

presque 7 ans il y a | 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 ...

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