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How to make a linear regression coefficient algorithm
Why do you want to write your own linear regression code? This is generally a bad idea. Never write code to do what a profession...

3 years ago | 0

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Populating off-diagonal blocks of diagonal matrix and making it sparse
There are several mistakes you seem to be making here, surprising if you have been reading a lot about sparse matrices lately. ...

3 years ago | 0

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lsqnonlin initial conditions (transcendental equation)
This does not make sense. x_data = importdata("x_data.mat"); x_data Your x_data vector is identically constant values. uniqu...

3 years ago | 0

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Philosophical question: How to get a vector from the output of solve? Why isn't it a vector already?
I tried it with a vector, wondering if that might make solve work more easily. And it does work. A = magic(3); X = sym('X',[3,...

3 years ago | 0

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Why does fmincon using the sqp algorithm need a full matrix to specify linear constraints?
This sounds like a good excuse for a feature request to me. However, my gut tells me there is a technical reason in the algorith...

3 years ago | 0

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How to build a function fun that takes as input the matrix A and as output provides the matrix B which is produced out of A in the following ways.
Possibly homework. (I never trust simple problems like this, where the goal is simply to move thigns around in a matrix. They ar...

3 years ago | 0

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How to get numerical values of nonlinear implicit function?
This is far easier then you may think. Um, trivially so. Just solve for t, as a function of y. Pencil and paper suffice for that...

3 years ago | 0

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How to write the equation in matlab I= A A* T² exp (qob/kT) exp (q(V - Rs I /kT)) (exp (-1/n) ? Why is the curve not shown in the drawing?
n=5.2; %Ideality factor A =8.16; %Richardson constant q = 1.602e-19; % electron charge K = 1.380e-23; %Boltzmann constant...

3 years ago | 0

Answered
How to find a point on this plot?
X = [-205078000000000.00 -190430000000000.00 -175781000000000.00 -156250000000000.00 -141602000000000.00 -117188000000000.0...

3 years ago | 0

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Answered
How to find a coordinate of a circle with a given equation tangent to the circle
You (apparently) want to find the circle of radius 4, with center at (0,y0), where y0 is unknown, that is tangent to the curve. ...

3 years ago | 0

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Answered
Fsolve can't solve this simple nonlinear equation
c = 3; eq = @(z) c - (z.^3/3 - z); [xsol,fval,exitflag] = fsolve(eq,0) fplot(eq,'b') hold on plot(xsol,fval,'rs') grid o...

3 years ago | 2

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Answered
Unrecognized function or variable 'imnoise2'.
which imnoise2 -all We cannot help you to use a function that does not exist as part of MATLAB, Possibly, the code you are usi...

3 years ago | 0

Answered
how to construct this in matlab? can anyone explain step by step?
One line of code. The explanation is right there. If you want more depth, the read the doc for jacobian. The good thing is, MATL...

3 years ago | 0

Answered
Colon syntax for creating a sequence of numbers that skips a given number?
You can't, at least not directly. But it is quite simple. For example: setdiff(1:10,3) % 1:10, missing 3 There are probably ot...

3 years ago | 0

Answered
normalizing a normal distribution
You don't show the actual mean and standard deviation used for that plot, so I'll make a wild guess. mu = 0.55; S = 0.18; fpl...

3 years ago | 0

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How can I calculate the index of when the sequence starts to repeat?
Why is it clear? It is not certain that it repeats at the points you have indicated. For example, what is the repeating sequenc...

3 years ago | 0

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Caesar's cypher working incorrectly
Question: What do the functions upper, and islower do in MATLAB? help upper So upper converts a string to entirely uppercase. ...

3 years ago | 0

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2nd Order ODE Euler method not producing expected results
That is not uncommon with Euler. It can be an unstable method. At each step, a small amount of error gets added in. Eventually,...

3 years ago | 0

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Answered
Is possible to integrate numerical data using quadrature method?
TRAPZ already is a quadrature method!!!!! TRAPZ is an implementation of trapezoidal integration, i.e., QUADRATURE. Where do you...

3 years ago | 0

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factorization of Multivariate polynomial
This is a bit of a hack of course, since factor seemingly should have solved the problem with the appropriate setting. The probl...

3 years ago | 0

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I'd like to skip the file that's not there and bring it up!
mat rap? Is that some godawful new song I've never heard before? ;-) That just seems, well, raprehensible to me. You don't want...

3 years ago | 0

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Answered
Most efficient way of looking up values in an array.
It hurts my head to see this ordering: (y1, x2, y2 and x1). Sigh. Why? Whatever floats your boat, I guess. I would not be usin...

3 years ago | 0

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Answered
matlab some polyfit problem
It is NOT abnormal. It is perfectly normal, and, in fact, perfectly correct. And the scaling is actually a valuable tool, when n...

3 years ago | 0

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how to use big prime in meshgrid
Pick some random integer X, less than p. You will need to use some tool capable of working with large integers, greater than the...

3 years ago | 1

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Answered
Find column number for every row in matrix
Simple. One line. A = randi([-5,5],[10,7]) [~,col] = max(A > 0,[],2) Why does it work? A > 0 returns an array that is true (1...

3 years ago | 0

Answered
Does the eig() function return normalize eigen vector (unit length)?
Yes. V is normalized to have unit 2-norm, at least in common cases. Surely you could have checked that? A = magic(5); [V,D] = ...

3 years ago | 0

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Answered
How to change the independent variable?
plot(x,f)

3 years ago | 0

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Solving differential equation in series general solution
I just showed you how to solve the problem, for two unknown constants. Of course, your question here involves an initial value a...

3 years ago | 0

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How to solve differential equation of series general solution
Assuming I typed in that line correctly... syms y(x) S = dsolve(8*x^2*diff(y,2)+10*x*diff(y)+(x-1)*y==0,'ExpansionPoint',0, 'O...

3 years ago | 1

Answered
Inquiry about Neural Network Structure for Lane Keeping Assist Example
Answers is not the MATLAB support team. Answers is purely volunteer supported. We have no acess to the information you would wan...

3 years ago | 0