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Torsten


Last seen: Today 2013 以来アクティブ

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How to solve differential equation including derivative of eigenvalue of tensor?
A third variante of the code also seems to work under MATLAB ( for high values of the integration tolerances :-) ) syms s A = ...

約6時間 前 | 0

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The (x,y) coordinates of a certain object as a function of time t are given by x(t) = 5t - 10; and y(t) = 25t2 – 120 t + 144, for 0 ≤ t ≤ 4. 1)
syms t x = 5*t-10; y = 25*t^2-120*t+144; distance_squared = x^2+y^2; d_distance_squared_dt = diff(distance_squared,t); time...

約7時間 前 | 0

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plotting a graph in a range
R = 2.303 * 8.314; F = 96500; ratio = @(T,eqv,z) exp(eqv*(z*F)./(R*T)); T = 283:313; plot(T, ratio(T,-0.06,1))

約20時間 前 | 0

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Array indices must be positive integers or logical values.
Everywhere where you want to multiply two quantities, you must set the multiplication sign. Something like r1 = k1(xch4*xh2o*P...

1日 前 | 0

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How do I solve a triple integral with one integral limit in function of another variable
beta1= 1.72; mo1=5; rmin1=10; rmax1 = 20; mmax1 = 10; fun=@(r,m,s) r.*exp(-(s.^2/2 + beta1*(m-mo1)))./sqrt(r.^2-rmin1); z...

1日 前 | 1

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2D Temperature distribution from 1D temperature distribution T(x)
x_position = [0.05; 0.0625; 0.075; 0.0875; 0.10; 0.1125; 0.125; 0.1375; 0.15; 0.1625; 0.175; 0.1875; 0.2; 0.2125; 0.225; 0.2375...

1日 前 | 0

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How to solve differential equation including derivative of eigenvalue of tensor?
Here is a numerical code to solve your problem. It's risky to use this approach since - as Walter Roberson noted - the ordering...

1日 前 | 1

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y(k + 2) = 0.25y(k), y(0) = 0, y(1) =1 (b). Write a Matlab script that solves y(k) pointwise for k =0,1,2,…,10. Ruun the program and verify that the solution is in accordance
Initialize y(1) = 0, y(2) = 1 and use a for-loop to calculate y(k+2) starting with k = 1 and ending with k = 9.

1日 前 | 0

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How to solve coupled second order ODE?
b = 0.1; fun = @(t,y)[y(2);-b*y(2)*sqrt(y(2)^2+y(4)^2);y(4);-b*y(4)*sqrt(y(2)^2+y(4)^2)]; y0 = [0;44.5;80;0]; tspan = [0,10];...

2日 前 | 0

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Getting the summation of a series
h=[ 1 3 5 7 9 11 13 15] ; ah = [35.8577 -6.2962 -1.2855 3.9251 -3.8197 2.2690 -0.4077 -0.9397 ]; alpha = lins...

2日 前 | 1

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Using fminsearch() for MSD system
p0 = [50 400]; p = fminsearch(@fun,p0) function objective = fun(p) k2 = p(1); c2 = p(2); %tspan = [0,0.3]; %observing sys...

2日 前 | 0

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Create a unit vector from two locations?
is this correct? No. MTH2 = [0.472 1.364 0.06] CoM = [0.471 1.147 0.903] UnitVector = (CoM - MTH2) / norm(CoM - MTH2)

2日 前 | 0

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how to use derivative of function using gradient?
Forget about y(13) and use dydz(2) = y(3); %Specific mass balance (CH4) dydz(3) = ((y(1)*y(3))+(dens_cat_weighted*r_CH4))/(D_m...

2日 前 | 1

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How to solve differential equation including derivative of eigenvalue of tensor?
See if it works. I cannot test it. syms s A = sym('A',[3 3]); % Define characteristic polynomial determinant = det(A-s*eye(3...

2日 前 | 1

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Minimalization problem LinearConstraint and conjugate gradient optimizer
According to the Python code, F is maximized, not minimized. Change in the below code if appropriate. M = [0.170543 0.327434 0....

2日 前 | 0

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Performing Chi Square Test
Source: https://de.mathworks.com/matlabcentral/answers/96572-how-can-i-perform-a-chi-square-test-to-determine-how-statistically...

3日 前 | 0

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Substitute symbolic matrices into numerical matrices
Do you know Cramer's rule ? A = sym('A',[3 3]); b = sym('b',[3 1]); x = sym('x',[3 1]); sol = solve(A*x==b,x) And now pleas...

3日 前 | 0

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System of Nonlinear Equations are failing to be solved
In my opinion, it should be eq1 = C_arg + P_arg == pi-phi_m*pi/180; instead of eq1 = C_arg + P_arg == pi-phi_m*180/pi; (see ...

3日 前 | 1

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Force a starting point on exponential graph
You must normalize to time = 0, not time = 24.4. The initial mass is the key, not the mass when already 24.4 (whatever) have pa...

3日 前 | 0

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How do I write the below code in efficient way in MATLAB?
Q = [16,32,64,128,256,512,1024]; VEC=[0.2380 0.2380 0.2380 0.2380 0.2380 0.2380 0.2380 1.1898 1....

3日 前 | 0

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Please help me in plotting the following functions.
Limits of Euler's beta function are 0 and 1, not a and b. So C_m,i^nu = beta(i*nu+3,(m-i)*nu)/beta(i*nu,(m-i)*nu) + 2 and th...

3日 前 | 0

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How to plot 4 curves with different constants?
y = @(C,x) (C-x)./(1+x.^2); C = [1 2 3 4].'; x = -2:0.1:2; plot(x,y(C,x))

5日 前 | 0

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Use of 'ArrayValued' in Matlab numerical integration
f = @(x) 5*ones(size(x)); integral(f,0,2)

5日 前 | 1

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How to write a code that takes a vector and outputs true if its the same forwards as it is backwards and false if not?
https://de.mathworks.com/help/matlab/ref/flip.html answer = isequal(v,flip(v))

5日 前 | 1

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Unable to perform assignment because the size of the left side is 360-by-1 and the size of the right side is 360-by-360.
Elementwise division is required: hip_percent(:,2) = 0.14*asis_d./hip_d + 0.5*(hip_d - asis_d)./hip_d; or simpler hip_percent...

6日 前 | 0

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angle function in matlab formula
It's all written in the MATLAB documentation of "angle": Algorithms angle takes a complex number z = x + iy and uses the atan2...

6日 前 | 1

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Using anonymous functions with vectors of unknown number of elements and getting the coefficients associated with the variables
Then n_s = 2; u = randi([-9999, 9999], 1, n_s) c = sym('c',size(u)); kappa = expand((1+u*c.')^2) coefficients = coeffs(ka...

6日 前 | 1

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Nonlinear regression not working
clc; clear all; input0= [160 159 158 157 156 155 154 153 152 151 150 149 148 147 146 145 144 143 142 141 140 139 138 137 136...

6日 前 | 0

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Find close points in two matrices of coordinates
Use "pdist2" to calculate the distances of the sites of the first set to the sites of the second set. Check which rows of the d...

6日 前 | 0

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