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Symbolic acos( cos(theta) ) does not return theta.
Is it true, that acos(cos(theta)) ALWAYS returns theta? TRY AN EXAMPLE. acos(cos(10)) So it is not true. It works the other wa...

mehr als 3 Jahre vor | 0

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curve fitting of two equation to two data sets simultaneously
Are the values of x the same for the two vectors y1 and y2? You don't show any data, so it is difficult to help more, as there ...

mehr als 3 Jahre vor | 0

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Create a single variable to store multiple correlation coefficients
A = rand(300,7); B = rand(1,300); C = corrcoef([A,B']); C = C(8,1:7) The correlation coefficiens of each column of A, agai...

mehr als 3 Jahre vor | 1

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How do I remove every row that has a zero in it?
TSLA = rand(366,7); TSLA(TSLA(:,4) == 0,:) = []; One line. No loops.

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Creating a mxn matrix that is all zeros except for the middle row and middle column which are 1s
Clearly a homework assignment. But now long since past, and with multiple answers, most of which are not in one line. However, s...

mehr als 3 Jahre vor | 1

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find the index number using bsxfun command
But why would you use bsxfun at all to do this? A = [12 13 15 1]; B = [1 2 12 15 10 13 11 14 3 4 5 6 7 8 9 16]; Use ismember ...

mehr als 3 Jahre vor | 0

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How can I rearrange equations to general form?
syms x y z eqn1=x+y+5==-z Nothing stops you from doing it yourself. For example, I might do: eqn1 = eqn1 + z Or, you can ev...

mehr als 3 Jahre vor | 0

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Inverse computation with a starting guess
It is often the case that someone THINKs they need a matrix inverse, yet they don't. And since you don't know if you can do this...

mehr als 3 Jahre vor | 1

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Vectorization approach to find matching elements in a matrix.
The part of your code that is a serious problem is where you build the arrays by growing them at each step. This is a really bad...

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Please how can I calculate the values of this finite sum of numbers in fully sequential , I'm finding it difficult
Easy peasy. sumof4thpowers = @(N) nchoosek(N+1,5) + 11*nchoosek(N+2,5) + 11*nchoosek(N+3,5) + nchoosek(N+4,5); For example: s...

mehr als 3 Jahre vor | 0

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optimization in smart energy management system.I have used MILP algorithm but i got infeasible solution no point satisfy the constraints.how could i sort out these issues.
No solution means exactly what it sounds like. NO solution. And for this class of problem, if it tells you that NO solution exis...

mehr als 3 Jahre vor | 1

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How to find derivatives using the diff command
There are two versions of diff in MATLAB. One operates on numeric vectors and arrays. It simply subtracts each number from the o...

mehr als 3 Jahre vor | 0

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Sum two matrices shifted by a non integer number?
There is no magic, whereby you can do things that take computational time, and do them instantly. What you want to do is implic...

mehr als 3 Jahre vor | 0

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Falkner-Skan code
You write: tau = (mu/(2*delta_y))*(4*un,2-un,3) But what des that mean to you? Is the fragment (4*un,2-un,3) intended to be...

mehr als 3 Jahre vor | 0

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sqrtm vs chol to produce draws the multivariate normal distribution
Don't bother. sqrtm also can have a similar problem, but you won't like what it does either! For example: A = rand(3,2); A = A...

mehr als 3 Jahre vor | 1

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How to get tangent line from a point not on the curve
The curve is: syms x y x0 F(x) = 945.75*x.^0.1002; A line tangent to the curve at any spcific location x0 would be simple to ...

mehr als 3 Jahre vor | 1

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Solving systems of trig equations
My gut says no symbolic solution will exist. But that does not mean my gut is accurate here. First, I would throw pencil and pap...

mehr als 3 Jahre vor | 0

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Merging piecewise polynomial (pp) structures
Is there any method to "merge" two PP functions? Well, no. Should there be one? I've been using and writing splines tools for 40...

mehr als 3 Jahre vor | 0

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Solve of implicity equations
alpha = 0.14; A = 3300; n = 0.01 ; b_2019 = 69100; rho = 0.02; uno_alpha_A = ((1-alpha)*A); dos_rho = (2+rho); uno_n = (1+n);...

mehr als 3 Jahre vor | 0

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What am I doing wrong?
ex2d is a function. You call a function, even a function you wrote yourself, by passing in arguments. For example, when you use ...

mehr als 3 Jahre vor | 0

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Why can't the index variable of a for loop be stored in a structure or other array?
Surely this is not a big problem? for ind = 1:10 status.ind = ind; % do Stuff end

mehr als 3 Jahre vor | 0

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is there any way to get a 2nd order polynominal through 2 points(each end point)
You want to fit a 2nd degree polynomial through two points? Of course only a straight line would work there through two points, ...

mehr als 3 Jahre vor | 1

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Is there an option to overwrite the old release when installing a new one?
I'll admit, I typically have 3 to 6 releases, and usually at the high end of that scale. They are useful to me in case I might w...

mehr als 3 Jahre vor | 0

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Volume of retinal lesion
It seems clear. You have multiple slices. Compute the area of each slice. At that point, you could just sum the area of each sli...

mehr als 3 Jahre vor | 1

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Plot complex signal with imaginary and complex
n = 2000; t = linspace(0,500,n); Signal = cos(t/10) + i*sin(t/10); % a simple signal, as a function of time. plot3(t,real(S...

mehr als 3 Jahre vor | 0

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Simplex optimisation using fminsearch
You are still looking for help on this? There is ABSOLUTELY no need to use a simplex optimizer for this problem. NONE AT ALL. L...

mehr als 3 Jahre vor | 0

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3rd order approximation solving for variable
x = (0.2:0.2:0.8); y = [.3168, .7404, 1.3736, 2.2692]; format long g p = polyfit(x,y,3) So, to within floating point trash...

mehr als 3 Jahre vor | 0

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General variable creation question
Don't generate a zillion variables. Instead, learn to use arrays. Cell arrays, structs, multi-dimensional arrays. This will leav...

mehr als 3 Jahre vor | 0

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How can I make a 3d plot with two equations and one variable?
By the way, there is NO reason to define f as symbolic, and then assign the number 0.0405 to f. f is now double preicsion. syms...

mehr als 3 Jahre vor | 0

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Solving an equation gives me three possible answers. How can I reference only one of these answers?
syms v f eta; f=0.0394; f = 0.0394; eqnvel = (9.801-3.802*v)*v*eta==(((f*200*(pi/4)*0.1^2)/6.434)+((27*(pi/4)*0.1^2)/64.34))*...

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