# Dana

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**Feeds**

Simulating a Continuous time markov chain

I don't know offhand of any non-homogeneous CTMC references, sorry. Regarding your case, this part of the help section regard...

3 years ago | 0

Submitted

Simulate Continuous-Time Markov Chains

This code can be used to simulate continuous-time Markov chains

3 years ago | 8 downloads |

Manually write code for a Vector Autoregression

First off, the interior (j) part of your loop doesn't make any sense, for several reasons: (1) Everything inside that loop is b...

3 years ago | 0

| accepted

Speed up a programme with for loops?

You can vectorize this easily for huge computational savings: %% Using loops tic E0=10; A = zeros(10000,10000); for k...

3 years ago | 0

plotting real solution of matrix system - time issue

I may be misunderstanding things, but it looks to me like the equation you're trying (det(S)=0) to solve is an 8th-order polynom...

3 years ago | 0

Plotting a function of a function with piecewise limits

It's the x(t) that shows up in your definition of f_1: t is a vector of real numbers (including non-integers), so x(t) is not a ...

3 years ago | 0

How can I debug this?

The error is because if you end up in the "otherwise" case of your switch(B), the variable Position doesn't ever get defined, so...

3 years ago | 0

| accepted

Optimization Problem definition the function

When you do f = @(x) ... the variable f isn't a function, but a function handle, i.e., a sort of "pointer" that allows you to ...

3 years ago | 0

| accepted

Point registration - How to get the eigenvectors to have a consistent direction?

This isn't my area of expertise, but one simple "orientation" test is as follows. Consider two scalars and . One way to check w...

3 years ago | 0

Finite difference problem showing NaN value

When M>=2, in the last line of your code, Rt_inc(M+1)=(v-1)*(rt_inc(M)^2)*((rt_inc(M+1)-rt_inc(M))/dt)/Sr(M); because rt_inc(M...

3 years ago | 0

| accepted

How to calculate multiple array at once?

load NEEDHELP n = numel(TEST); meanVolt = zeros(1,n); for j = 1:n meanVolt(j) = mean(TEST(j).data.Voltage_measured(1...

3 years ago | 1

| accepted

Help with storing values for the loop I created want to store them with where they are located on the vector

Is this what you're after? vector = [4 1 6 9 2 1 8 3]; [sorted,sortinds] = sort(vector) sorted = 1 1 2 3 ...

3 years ago | 0

Finding specific peaks in noisy data

This exercise looks like it involves some subejctivity. For example, in the second plot, the "peak" on the left isn't really a p...

3 years ago | 0

| accepted

Reducing the number of count/values in each bin in MATLAB

In this line: Count_Liquid = (Count_Liquid + histcounts(CTT_liquid, Intervals_CTT)) the variable Count_Liquid is computed usin...

3 years ago | 0

| accepted

I'm Trying to run iterations until convergence.

Well, you haven't actually told us what the problem you're encountering is, but right away I can see several problems. First, yo...

3 years ago | 0

Out of memory when converting symbolic matrix into function or by simplifying it

First, it's worth pointing out that if you call whos, symbolic variables always show up as 8 bytes. That's not because that's li...

3 years ago | 0

| accepted

How to find the roots along a real line?

Numerical solvers are not guaranteed to find all roots of an expression. That's what's happening here. The algorithm vpasolve is...

3 years ago | 1

| accepted

How would one proceed to plot this?

What is u supposed to be? Some kind of vector you've previously defined? If so, and assuming u is a column vector whose j-th ele...

3 years ago | 1

Format a matrix with entries displayed as exact values

I'm not sure exactly what you're after. Here are some possibilities >> format short >> disp(AB) 0 1.0000 1.000...

3 years ago | 0

| accepted

How can I create different colors in the plotted chart for a lot of data

Are you trying to plot 70 different data series on the same plot? If so, Matlab's default color scheme won't give you 70 differe...

3 years ago | 1

how to find the next maximum value in column of the matrix which is different at the index of the first

I'm not aware of any built-in function. You'll probably have to write one yourself. Something like: function [mxs,mxinds] = mym...

3 years ago | 0

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Unable to perform assignment because the left and right sides have a different number of elements

Your varibles k1, k2, k3, and k4 are vectors, so when you do the line near the bottom of your loop Nw(i+1)=Nw(i)+step/6*(k1+2*k...

3 years ago | 0

| accepted

Impose to a vector not to have zero elements

speed(n,:)=max(sol.y(N+1,:)-sum(sol.y(N+2:N+n,:),1), 0);

3 years ago | 0

Working with complex numbers in the Symbolic Math Toolbox. Why does angle(A) returns atan2(sin(alpha),cos(alpha)) instead of just alpha?

This seems to be the result of a gap in MATLAB's symbolic logic. Your assumption assume(alpha>-pi & alpha<pi) should be enoug...

3 years ago | 1

| accepted

Trying to assign a 3x1 matrix to the 1st iteration of a for loop.

If y is an array that's tracking values of a 3-element vector as you iterate on k, then you need to make y a matrix. If I've und...

3 years ago | 1

| accepted

Displaying output for each iteration

It's printing on every iteration, it's just printing it all on one line so it looks like only one thing is getting printed. The...

3 years ago | 0

how to solve this system of equation? (not sure what it's called/)

syms fo fa n t % note you had f0 instead of fo here in your original post eqn1 = fo*cosd(t)+fa*sind(15)==0; eqn2 = fo*sind(t)...

3 years ago | 0

Sparse matrix multiplication complexity and CPU time

Assuming by A^T you mean the transpose of A, and assuming you already have A and A^T stored, then yes, the complexity of A^T*A s...

3 years ago | 1

| accepted

Indexing arrays of binned data

Index in position 1 exceeds array bounds (must not exceed 1). This error is an indexing error, which suggests to me that one or...

3 years ago | 0

How to store iteration while loop result?

If you only expect a relatively small number of iterations to occur, then the following will work fine: x0sv = []; fxsv = []; ...

3 years ago | 0