Torsten

Last seen: 9 months 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)...

9 months ago | 1

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

9 months 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 ?

9 months ago | 0

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

10 months 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...

10 months 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)

10 months ago | 2

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Answered
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,...

10 months 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];...

10 months ago | 0

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

10 months 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...

10 months ago | 1

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

10 months 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.

10 months ago | 1

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

10 months 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));

10 months ago | 1

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L2 norm of the column
M_norm = normc(M)

10 months 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.

10 months 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 ...

10 months 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 ...

10 months ago | 0

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

10 months 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)...

10 months ago | 0

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

10 months ago | 0

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

10 months ago | 0

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

10 months 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,:...

10 months 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...

10 months ago | 1

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

10 months 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...

10 months 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 ...

10 months 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.

10 months 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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