Answered
error using unique function
What type of data is in the cell array? When you use UNIQUE on a cell array, the only case that's supported is when the element...

13 years ago | 0

| accepted

Answered
Can I use hexa address like '0xF2' value in Matlab?
Don't know anything about the second question. As to the first, because MATLAB does not have a hex format in the language, you ...

13 years ago | 0

Answered
Compare inv(X) Vs mex inv (X)
I think it's rather likely with a difference of that magnitude that you have left memory integrity checks on. Try >> cfg =...

13 years ago | 1

| accepted

Answered
quadl with vector bounds
One option is to use ARRAYFUN >> arrayfun(@(b)integral(@(x)x.*sin(x),0,b,'abstol',1e-5,'reltol',1e-5),0:3) ans = ...

13 years ago | 0

| accepted

Answered
How to make a FOR loop to be efficient
There is no way to do what you ask, and it would not help you much if there were. What is it that that you're really trying to ...

13 years ago | 0

Answered
Numerical integration
If I understand the question properly, given a function f(x,y) and integration limits a <= x <= b, g = @(y)integral(@(x)f(x...

13 years ago | 0

Answered
integrate function
The problem has nothing to do with the integrator, rather with the way you have written the integrand: >> a = 1; b = 1; ...

13 years ago | 1

| accepted

Answered
Using integral function for a function which is defined with an integral
>> phi = @(r)arrayfun(@(x)integral(@(t)exp(-t.^2./2),-inf,x),r); >> phi(-3:3) ans = Columns 1 through 5 0.003...

13 years ago | 0

Answered
quad2d precision?
I don't know what "60-100%" accurate means. Perhaps it would help to give a few examples of results that you regard "inaccurat...

13 years ago | 0

Answered
integration
I never quite know what to say when questions like this come up. There's nothing wrong with wanting to do integrals analyticall...

13 years ago | 2

Answered
Integration using a vector as function parameter
Not sure of your intention. This is how I interpreted what you wrote: >> N = 1:4; >> Crush = @(x,n) x.^n; >> integra...

13 years ago | 0

| accepted

Answered
matlab embedded fuction in simulink
I don't know anything about XSteam, but whenever you use an extrinsic function call, you need to pre-declare the output so that ...

13 years ago | 3

Answered
numerical integration
You can't just integrate over the singularity near x=0.66. That's why you're getting the wrong answer.

13 years ago | 0

Answered
Problem using the defined function triplequad
TRIPLEQUAD requires constant limits. You cannot have bounds that depend on integration variables. If you have R2012a, try INTE...

13 years ago | 0

Answered
surface integral computation.
You should never expect an exact result from a numerical integrator. Even when there is no discretization error, there can be s...

13 years ago | 1

Answered
problem with integrand and quad2d
Look at the definition of Vs. If you raise a negative quantity to a non-integer power, you get a complex number. The integrand...

13 years ago | 0

| accepted

Answered
Using quadgk inside a loop
You've got a couple of problems here that jump out at me. One is that your expression for n0 tends to lose precision due to the...

13 years ago | 0

| accepted

Answered
Using quadgk inside a loop
I agree with Richard. We'll probably need to see one of your attempts, but I can take a guess. Most likely you're having troub...

13 years ago | 0

Answered
Integration of a function from R^1 to R^n
The integral of a vector-valued function is vector-valued. You simply integrate each component. This can be done with QUADV or...

13 years ago | 0

| accepted

Answered
Matlab Coder : codegen for mvnrnd
Instead of using sigma in that -args list, use sigma_type = coder.typeof(0,[2,2],[true,true]) This means the type is doubl...

13 years ago | 0

Answered
integration using quadgk() in the complex plane
I'm going to assume this is a homework problem. Complex integrals generally depend on the path chosen. Here you want to go fro...

13 years ago | 0

Answered
problem with double integral, dblquad and quad2d
syms ne me epsilon eta zeta; K1=76*10^9; K2=150*10^9; G1=26*10^9; G2=78*10^9; Vs=(((zeta/2)+(1/2))^ne)*((eta/2)^me); ...

13 years ago | 0

| accepted

Answered
in simulink, how to call functions (such as "quadv") which need to call function handles
First, regarding QUADV in particular, the MATLAB Function Block supports QUADGK. You may find that it is competetive to call QU...

13 years ago | 2

| accepted

Answered
Integration of some function containing a singularity
QUADGK has no trouble when t=1, but for t=2,3,4,... the correct answer, if I am not mistaken, is Inf. You were expecting QUADGK...

13 years ago | 0

| accepted

Answered
Double integration
If you have the 2012a release, just use INTEGRAL2: >> a = 2; b = 3; m = 2; n = 3; c = 2; d = 3; >> f = @(x,y)exp(-a*x-b*...

13 years ago | 2

| accepted

Answered
weird Problem with dblquad
The integrator QUAD (which is called in a nested way by DBLQUAD) has an internal limit on the number of function evaluations it ...

13 years ago | 0

| accepted

Answered
Large error between exact analytic answer and numeric integration
Your formulation has many problems. I don't see that you're using a mass matrix with ODE45, and you also have not inverted M, a...

13 years ago | 0

Answered
Problem with matlab, simpsonrule
Looks to me like you're just running out of floating point precision. Double precision has about 16 decimal digits max, and you...

13 years ago | 0

Answered
coverting to c code
CODEGEN is the command-line way, CODER is the graphical user interface. It's the same technology "under the hood". I expect "c...

14 years ago | 0

Answered
why dblquad can not be used to evaluate the bessel function of the second kind bessely
Integrate using QUAD2D and put the singularity on the boundary. >> f = @(x,y)-abs(x-y).*bessely(1,abs(x-y)) f = ...

14 years ago | 1