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# Torsten

##### Last seen: 약 1달 전
2,569 2013 이후 총 참여 횟수

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

약 1달 전 | 1

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

약 1달 전 | 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 ?

약 2달 전 | 0

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

약 2달 전 | 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...

약 2달 전 | 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)

약 2달 전 | 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,...

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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];...

약 2달 전 | 0

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

약 2달 전 | 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...

약 2달 전 | 1

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

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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.

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

약 2달 전 | 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));

약 2달 전 | 1

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L2 norm of the column
M_norm = normc(M)

약 2달 전 | 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.

약 2달 전 | 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 ...

약 2달 전 | 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 ...

약 2달 전 | 0

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

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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)...

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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

약 2달 전 | 0

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Extracting values that are greater than the threshold

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

2달 전 | 1

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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,:...

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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...

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

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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...

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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 ...

2달 전 | 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.

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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...

9달 전 | 0

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