Torsten

Last seen: 1 year ago

2,569 total contributions since 2013

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Answered
How do I write an inductive sequence?
N = 10; % define number of recurrence terms to be calculated x = zeros(N,1); x(1)...

1 year ago | 1

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substract array elements based on other arrays
setdiff(All,union(R1,R2))

1 year ago | 1

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Solving large sparse Ax=b with lower bound constraint
Did you try starting from the solution of the unconstraint problem ?

1 year ago | 0

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dsolve second order differential equation
dySol=diff(ySol,x); dySol(585.8)

1 year ago | 0

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How to plot graph of value of variable when a parameter is varied
Your equations can only be solved for one value of R, namely R = 0.3 + 0.366*exp(-0.3). This can be seen by dividing equation 1...

1 year ago | 0

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write a function called tri_area returns the area of a triangle with base b and height h
function area = tri_area(b,h) area = 0.5*b*h; end From the command window A = tri_area(3,2)

1 year ago | 2

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Finite Difference Method to find Steady State
T = zeros(6,5); T(1:6,1) = 10; T(1:6,5) = 50; T(1,2) = 73; T(1,3) = 100; T(1,4) = 85; for n=1:5 for i =2:4 T(n+1,...

1 year ago | 0

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Answered
generate random number from a function that serves as PDF ?
N = 1000; U = rand(N,1); n1 = numel(U(U<=w1)); n2 = N - n1; X1 = sigma1*randn(n1,1); X2 = sigma2*randn(n2,1); X = [X1,X2];...

1 year ago | 0

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How can I randomly extract a element in a vector?
random_element = v(randi(numel(v)))

1 year ago | 0

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what numerical approach is used for bvpinit?
In bvpinit, the user just specifies a guess on how the solution of the boundary value problem might look. A numerical method i...

1 year ago | 1

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element wise product matrix-vector
Y_t = bsxfun(@times,Y_t,w)

1 year ago | 0

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Unexpected output when trying to plot the solution to a system of nonlinear differential equations
Use hold on between the two plot commands.

1 year ago | 1

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How do I make a function work with vectors?
tanH = (exp(x)-exp(-x))./(exp(x)+exp(-x))

1 year ago | 0

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How can I put an integral inside a for loop when the bounds depend on the loop's variable?
Phi_ij1 =@(i,j) integral2(@(y,x) B_zi(i,x,y),0,y_min1(j),0,@(y)x_max1(y,j));

1 year ago | 1

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L2 norm of the column
M_norm = normc(M)

1 year ago | 0

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Curve fitting toolbox - gaussian curve to histogram with no workspace data for the y - value
I think Matlab's "mle" is what you want instead of the curve fitting toolbox.

1 year ago | 0

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lsqnonlin and stretched exponential function
error_bounds = nlparci(x,residual,'jacobian',J) after the call to lsqnonlin. If you don't have a toolbox with nlparci, search ...

1 year ago | 0

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I'm getting an error related to fmincon
If you mean the eigenvalue largest in magnitude, this should give you a start. Incorporating fmincon can automatize the search ...

1 year ago | 0

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root of nonlinear equation
ft = @( c ) 0.25* ... instead of ft = 0.25* ...

1 year ago | 0

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stop Ode45 when y is less than a value
As defined, ode45 expects myEvent to have 2 input parameters, but you use 3. Use Opt = odeset('Events',@(t,u)myEvent(t,u,minu)...

1 year ago | 0

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How to add the value of the 3 highest elements automatically from a vector?
[~,idx]=maxk(y,3); y(idx)=y(idx)+sx; y

1 year ago | 0

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Extracting values that are greater than the threshold
OxygenAlt = Alert(Alert(:,3)>21)

1 year ago | 0

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Fitting to an intergral
Use "ArrayValued=true" as option in the call to integral.

1 year ago | 1

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Answered
Hello guys, I need help.
[X1,X2,X3]=ndgrid(x1,x2,x3); Z=f(X1,X2,X3); %assumes f is vectorized M=[X1,X2,X3,Z]; [~,idx]=sort(M(:,4)); sortedM=M(idx,:...

1 year ago | 0

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Temperature ramp then keep it at constant temperature
Copy the lines where you define the global parameters to the beginning of function "fun" and remove them in the upper part of th...

1 year ago | 1

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Best way to solve my implicit equation
Use "fzero" or "fsolve".

1 year ago | 1

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How can i implemente this PDE system?
Use "pdepe". You will need to specify four boundary conditions for this solver, although only two for the T equation were neces...

1 year ago | 0

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For Loop Which Skips Numbers Based on Row Vector
Use "setdiff" to remove the row vector elements from the range of the for-loop and name the vector v. Then simply type for v ...

1 year ago | 0

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Euler function where you can define equation, starting x and y values, number of steps and the step length
Use g = f or g = @(x,y) f(x,y) instead of g = @(x,y) f.

1 year ago | 0

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Answered
Integrate for a specific period of time
t=0:.01:10; x = zeros(numel(t)); x(1) = 1; fun_xdot = @(t,x) -2*(x^3) + sin(0.5*t)*x; for i = 1:numel(t)-1 x(i+1) = x(i...

1 year ago | 0

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