Dana

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统计学

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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...

4 years 前 | 0

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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...

4 years 前 | 0

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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...

4 years 前 | 0

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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...

4 years 前 | 0

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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 ...

4 years 前 | 0

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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...

4 years 前 | 0

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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 ...

4 years 前 | 0

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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...

4 years 前 | 0

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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...

4 years 前 | 0

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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...

4 years 前 | 1

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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 ...

4 years 前 | 0

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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...

4 years 前 | 0

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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...

4 years 前 | 0

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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...

4 years 前 | 0

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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...

4 years 前 | 0

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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...

4 years 前 | 1

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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...

4 years 前 | 1

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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...

4 years 前 | 0

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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...

4 years 前 | 1

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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...

4 years 前 | 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...

4 years 前 | 0

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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);

4 years 前 | 0

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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...

4 years 前 | 1

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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...

4 years 前 | 1

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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...

4 years 前 | 0

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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)...

4 years 前 | 0

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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...

4 years 前 | 1

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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...

4 years 前 | 0

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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 = []; ...

4 years 前 | 0

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What is the solution for "Error using griddedInterpolant The grid vectors must contain unique points."
You're interpolating based on the gridpoints located in column J of your Excel file. Each gridpoint must be unique (i.e., differ...

4 years 前 | 1

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