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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...

4 years ago | 1

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Answered
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))

4 years ago | 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...

4 years ago | 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...

4 years ago | 1

Answered
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...

4 years ago | 0

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Answered
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...

4 years ago | 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.

4 years ago | 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];...

4 years ago | 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...

4 years ago | 1

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Answered
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...

4 years ago | 0

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Answered
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)

4 years ago | 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...

4 years ago | 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...

4 years ago | 1

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Solving a numeric equation matlab shows results with up to 32 decimals. How can I get this for the operation below for Exmpl? format longE for Exmpl. allows only 16 digits.
digits(100) vpa(sqrt(sym('3')))

4 years ago | 0

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Answered
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....

4 years ago | 0

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

4 years ago | 1

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Answered
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...

4 years ago | 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 ...

4 years ago | 1

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Answered
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...

4 years ago | 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....

4 years ago | 0

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Answered
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...

4 years ago | 1

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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))

4 years ago | 0

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

4 years ago | 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))

4 years ago | 1

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Answered
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...

4 years ago | 0

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Answered
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...

4 years ago | 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...

4 years ago | 1

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Answered
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...

4 years ago | 0

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Answered
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...

4 years ago | 0

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How to fasten the loop
Maybe there are faster commands than arrayfun for extracting the elements of LONG in cell arrays that correspond to sequences of...

4 years ago | 0