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# Torsten

Last seen: Today Attivo dal 2013

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I'm having an issue defining the initial conditions for solving a system of differential equations
You have two second-order ODEs for th and w. Thus you need 4 boundary conditions (not 6) that can be prescribed for w, dw/dx, ...

circa 3 ore fa | 0

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Received this error, not sure how to fix
Maybe you mean for ni=1:j instead of for ni=1+j If not, you try to access N(7) which does not exist.

circa 7 ore fa | 0

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Vector Length Error when Calling Function
You overwrite MATLAB's intrinsic "length" in the lines length = data(2:end,2) length = cell2mat(length)

circa 8 ore fa | 0

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How to match matrix elements for a condition?
If A becomes larger, this brute-force way of solving will become intractable. A = [15 25 36 17 48 59 31 64 18 21 97 84 31 64 15...

circa 8 ore fa | 0

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How do I use my data set in an equation?
Say lm is 2x6, e.g. lb = [1 2 3 4 5 6] lm = [7 8 9 10 11 12;13 14 15 16 17 18] What would you like to compute ? [log(1/7) lo...

circa 8 ore fa | 0

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error >> Matrix dimensions must agree. How to fix
z doesn't need to be prescribed in array form because you integrate with respect to z. Here I assume that the integration variab...

circa 15 ore fa | 0

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How to get the formal expression of the expansion of power of a polynomial with symbolic calculation
syms x n = 10; k = 2; a = str2sym(compose("a" + (0:n-1))) f = x^n + sum(a.*x.^(0:n-1)) g = f^k; coefficients = coeffs(coll...

circa 18 ore fa | 0

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Using MATLAB to do Numeric Calculus
Your code is correct. Here is a simpler way to define s and v. Just substitute tcrash by tmax. tcrash = 1596.2/(2*4.905)+sqrt...

1 giorno fa | 0

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probability that values are belong to an interval
It depends on how x is distributed. If f is the (continuous) probability density function for x, you get the probability p as ...

1 giorno fa | 0

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How to use ode15s to solve a stiff ode with mass?
tf = 200; x0 = [0 0 0 0 2500 0 0.8 0 50 50 50 50 5]; M = zeros(13,13); M(1,1) = 1; M(2,2) = 1; M(3,3) = 1; M(4,4) = 1; ...

2 giorni fa | 0

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vectorized operations on symbolic functions
rng("default") syms x1 x2 x3; % symbolic variables y = x1^3/3 + x2^2/2 - x3; % symbolic function y X = rand(500,3) % each row...

3 giorni fa | 0

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Dot product does not work for symbolic vectors
Since you cannot assume functions to be real-valued, you must use dot(r,r) - (r_x*r_x' + r_y*r_y' + r_z*r_z' ) instead of dot...

3 giorni fa | 1

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NaN in converting a sym to double
exp(lambda1*c0*eta0) and exp(lambda3*c0*eta0) evaluate to Infinity for s big enough (s slightly bigger than 0 already suffice...

3 giorni fa | 0

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How to plot a three variable complex function
You cannot plot the complete result of a function that depends on three independent variables. But you can plot it on slices (i...

4 giorni fa | 0

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PDEPE solver failure (spatial discretization) ; partial differential/derivative temperature modelling
Please include the constants defined as globals so that we can test your code. One obvious error is the boundary condition for...

4 giorni fa | 0

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Packed bed storage modeling probelm
rhoS = 2750; % Solid density [kg/m^3] cpS = 850; % Solid specific heat capacity [J/(kg*K)] ks = 1.28; ...

4 giorni fa | 0

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Extracting values from optimization variable and setting constraints
Defining vectors QTYup and QTYdown as integer vectors with 0<=QTYup(i)<=5 and -5<=QTYdown(i)<=0 (i=1,...,3 for tomatoes, onions ...

4 giorni fa | 0

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I am trying to form a conditional loop that shows the growth of money, I put in \$1000 every year and it grows by 85 for ten years but keep returning one value
money = zeros(10,1); supersaver = 1000; Return = 0.08; money(1) = supersaver*(1+Return); % Money at end of year 1 for i = 2...

4 giorni fa | 0

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Getting error while trying to solve boundary condition equations.
For M1 = 0-0.4, bvp4c cannot find a solution. So I started with M1 = 0.5. close all; clear all; clc; K1=0; eta1=0.2; eta2=0....

5 giorni fa | 0

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Meijer G-function MATLAB Implementation Problem
Cbar = 1.4361*meijerG([0],[1,1.22,1.72],[0.7200,1.2200,1.4510,1.9510,1.2550,1.7550,0,0],[],331.6059)

5 giorni fa | 1

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Where can I learn how to do regression in Matlab
First learn how to approach your problem from the statistical side, then look how to implement this theoretical approach in MATL...

5 giorni fa | 0

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Trying to use Newton Raphson Method to solve circuit design
w = 1; T = 2*pi/w; tn = 0:T/40:T; I = 1e-15; Vt = 25.9e-3; Vo = 10; V1 = 6; V2 = 6; R = 50e3; x0 = [0.7;0.7]; e_d = 1...

5 giorni fa | 1

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rror using odearguments @(T,Y)ODE_LR(T,Y,KF_L,KB_1) returns a vector of length 2, but the length of initial conditions vector is 10002. The vector returned by @(T,Y)ODE_LR(T,Y
Use Non_Active_Receptor_concentration0 = 100; Active_Receptor_concentration0 = 0; instead of Non_Active_Receptor_concentrat...

6 giorni fa | 0

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plot the function which is dependent on x, y and z with x, y and z on three axis.
You can plot the function on slices (i.e. 2d-objects (e.g. planes)) through the volume of interest. Of course a full plot over ...

6 giorni fa | 0

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How do I feed ODE45 a cell array ?
Use state_dot as the function that you pass to the integrator. I followed your coding - the problem setup could have been much ...

6 giorni fa | 0

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Left and Right side have different elements
Replace t by t(i) in the loop.

6 giorni fa | 0

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Getting integrand error from triple integral code code
f must return a vector of ones of the same size as the inputs x, y or z (which all have the same sizes). Thus replace f = @(x,...

7 giorni fa | 1

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need to compile outputs from for loop into array
In most cases, outputarray = zeros(1,nnz(mod(yeararray,4)==0)) will work.

7 giorni fa | 0

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Error ---> Brace indexing is not supported for variables of this type.
clc clear g = 9.81; L = 0.1; m = 0.5; zeta = 2; x0 = 0.25; v0 = 0; tspan = [0 10]; step_sizes = [0.1, 0.05, 0.025...

7 giorni fa | 0