Answered
Beginner coding; my second, simpler approach at trying to make all elements distinct.
FYI, to generate random integers you can use the randi( ) function instead of ceil(value*rand( )): https://www.mathworks.com/he...

4 years ago | 0

Answered
How to make a "page transpose" in a 3D matrix without using the function pagetranspose?
Mtranspose = permute(M,[2 1 3]);

4 years ago | 2

| accepted

Answered
How to multiply an inverse matrix (nxn) by an array (nx1) using for loop
Not sure why you have a for-loop at all. Maybe you can explain this. If you just want to multiply the explicit inverse by a vect...

4 years ago | 0

Answered
Adding numbers to an array
You don't really need both h and hnew. Just use h and some indexing. E.g., h = zeros(1,45); % allocate expected result k = 1; ...

4 years ago | 0

| accepted

Answered
rounding issues in matlab, need to force values to 0
Instead of if abs(y1)< 1e-6 y1=0; end try y1(abs(y1)<1e-6) = 0;

4 years ago | 2

| accepted

Answered
why will the area only work for the circle and not the other shapes
To compare strings, do not use the == operator which does an elementwise compare. Instead, use a function meant for comparing st...

4 years ago | 0

Answered
if loop error in MALAB
Change your test to if isempty(n)

4 years ago | 0

| accepted

Answered
Index exceeds number of array elements
I think you want this for i = length(t)-1 to be this instead for i = 1:length(t)-1 The way you have it currently coded, ...

4 years ago | 1

Answered
Calling a Matlab function in Fortran
You have two fundamental errors with this code. You do not use the correct variable type for my_x, and you cannot call mexCallMA...

4 years ago | 0

Answered
MATLAB's inefficient copy-on-write implementation
See Loren's Blog on this topic. Basically, to write functions that can modify a variable "inplace" you need to call that functio...

4 years ago | 1

| accepted

Answered
How to multiply one array to all elements of a vector with a different size?
You can use implicit expansion with the element-wise multiply operator: c = a .* reshape(b,1,1,[]);

4 years ago | 0

Answered
sprintf, round-off, floating point bug?
I don't have all the versions installed necessary to investigate all of the results posted above, but this may simply be a "ROUN...

4 years ago | 0

Answered
how to save a figure plotted with matlab with best quality in .ppt or .pdf file?
See this FEX submission by Yair Altman: https://www.mathworks.com/matlabcentral/fileexchange/23629-export_fig?s_tid=srchtitle ...

4 years ago | 0

| accepted

Answered
how to read and write half precision arrays via mexFunction
Very unfortunately, MATLAB has implemented the half precision data type as an opaque classdef type instead of a simple numeric t...

4 years ago | 0

Answered
how to write mex function when input is a matlab function
This can be done, but it will not be efficient. The basic problem is that C/C++ doesn't understand anything about MATLAB functio...

4 years ago | 0

Answered
Is it possible to process the sparse matrix faster with vectorization instead of for loop?
You need to re-evaluate how you are doing things. In the first place, you have the Euclidean calculation wrong. It should be thi...

4 years ago | 0

Answered
How to exchange data between two C++ MEX files
Your current scheme is not foolproof. How does the 1st mex function know when it is safe to unlock and clear memory? How does th...

4 years ago | 0

| accepted

Answered
How to solve Lc=y without backslash operator?
First, I am assuming there is a typo and the system you are solving is Ly = c, not Lc=y. Second, you made a good start by writi...

4 years ago | 0

Answered
I am using euler's method to solve a differential equation, but when I run the code it doesn't plot.
Take a look at these lines: t0=0; %start time t1= 500; %finish time dt = 100000; Your stepsize is much larger than the total...

4 years ago | 1

| accepted

Answered
Accessing struct using C library always NULL
Typically, it is best just to post your code so we can see exactly what you are doing, instead of posting a description of your ...

4 years ago | 1

| accepted

Answered
Errors while trying to setup equation for root finding.
Did you mean multiply by the "a"? x_pdo = z_pdo/(1 + a*(k_pdo - 1)); x_water = z_water/(1 + a*(k_water - 1)); x_glycerol = z_...

4 years ago | 0

Answered
How do I access a field from a function's input?
Assuming you are passing in a character string for freq, use this syntax: output = myStruct.(freq);

4 years ago | 0

| accepted

Answered
How can I obtain the T and Y for R Runge Kutta method?
The first version has an error. This line: k3=h*feval(f,T(j),Y(j)); should be this instead: k3=h*feval(f,T(j)+h/2,Y(j)+k2/2);...

4 years ago | 0

Answered
How to solve array indices error?
x1 = 0*ft; : distance1=sqrt((x1-x2)^2+(y1-y2)^2+(z1-z2)^2); : sp = distance1(x1,y1,z1,dx,dyv(i),dz); % incident di...

4 years ago | 0

Answered
Solving ODE using Euler Method and 4th Order Runge Kutta Method
You pretty much have the Euler scheme worked out, so I will help you with a vector formulation. Take this code: for i=1:n ...

4 years ago | 0

| accepted

Answered
Problem finding sum of array using vectorization
The first element of x is 1, so that element produces 1/(1-1) = 1/0 = inf in the second line. You need to rewrite that second li...

4 years ago | 0

Answered
Multiplication of large matrix with its transpose
The fastest way is to simply write it as A * A', because MATLAB will see that the operands are the same and call a special multi...

4 years ago | 0

Answered
Solving ODE in MATLAB using Runge-Kutta method of order 4
Why aren't you using this to update z: z(i+1) = z(i) + (1/6)*(l1+(2*l2)+(2*l3)+l4);

4 years ago | 0

Answered
Why is the string type not implemented as standard type?
All of the standard full numeric types as well as char and logical are implemented as simple rectangular data arrays. The string...

4 years ago | 1

Answered
how to print randomly selected column?
Shouldn't that be size(data,2)? Also, generally you should be using string comparison functions for the tests, not the == opera...

4 years ago | 0