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Energy method with Hermite cubic function (2 essential condition)
m and nv are inputs to the function "ex_enerHermite". Where do you set these values and where do you call the function ?

3年弱前 | 0

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Conversion from ellipsoidal to geocentric cartesian
I don't think that you need iteration. The 5 steps for conversion are given in the section "Algorithm" under https://uk.mathwor...

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Extract columns and rows from matrix
first = rand(5) second = rand(5) second(5,:) = first(:,1).'

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Need some change in the present Analytical solution code which I'm unable
syms x F1(x) G1(x) H1(x) n fw h Nt = 0.5; Nb = 0.5; Pr = 1; Le = 2; DF = diff(F1,x); eq1 = diff(F1,x,3) + diff(F1,x,2) == 0; ...

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Please help with fzero function . Thanks
Convert dh_CO2 and dh_H2O from symbolic functions into function handles by using "matlabFunction". After this, they can be use...

3年弱前 | 1

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Don't know how to put set of numbers in equation
Replace N = a / (sqrt(1-e2 * sin(fi)^2))^3/2 by N = a ./ (sqrt(1-e2 * sin(fi).^2)).^3/2 For an explanation, I suggest readin...

3年弱前 | 0

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Index exceeds the number of array elements error
y(i-N:i-1) is a vector of length N z(i-N:i-N+M) is a vector of length M+1 y(i) is a single value of length 1 How do you imagi...

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Fsolve 19 state variables with matching dimensions
Rename F in this assignment: F = Fin + Fr F is reserved for the 19-element function vector that you return to fsolve.

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Please help, I have no idea how to do this integral in matlab
The integral seems to exist for those values of theta0 with cos(theta0) ~= 0, thus theta0 ~= (2*k+1)*pi/2 for k in Z. In this c...

3年弱前 | 1

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Simplify symbolic division abs(Z)/Z
Use z*z' instead of abs(z)^2: syms z u = z*z'/z

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Why is ode45 failing to solve this system of ODEs?
Your matrix L has 9162 NaN values. This is most probably caused by the division by (x+1) which is problematic for the problem b...

3年弱前 | 1

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Store Values in Array per Loop iteration issues
Replace [i, ~] = find(Strain < 0.01 | Strain > 0.15); Strain(i, :) = []; by [j, ~] = find(Strain < 0.01 | Strain > 0.15); S...

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I need to pursue the developement of a variable within a function, but I don't know how.
[t_num,x_num]=ode15s(@DGL,tspan,q0); C11_num = c_m+c_a*sin(om*x_num(:,1));

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Im trying you solve the component mass balance and energy balance equations for an adsorption system. Im getting some exponential growth in the plots.
Use Upwind Differencing for the convection terms: dTdz(2:n) = (T(2:n)-T(1:n-1))/h; dJdz(2:n) = (J(2:n)-J(1:n-1))/h...

3年弱前 | 0

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Error using bvp4c Unable to solve the collocation equations -- a singular Jacobian encountered. Error in MHDI_ori (line 54) sol = bvp4c (@OdeBVP, @OdeBC, solinit, options
You say you want to have yb(2) - R = 0 and yb(2) - 1 = 0 at the same time as boundary conditions. This is not possible.

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Error with 3D interpolation: Interpolation requires at least two sample points for each grid dimension
VsGrid = csvread('3d_Vs_utm_samplefile.csv'); X = VsGrid(:,1); % UTM X Y = VsGrid(:,2); % UTM Y Z = VsGrid(:,3); % Depth V =...

3年弱前 | 0

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Where to find Hash Sums of Matlab Downloads?
Does this help ? https://codesigningstore.com/how-to-check-file-checksum https://uk.mathworks.com/matlabcentral/answers/540626...

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How do I generate a random number vector composed of just 1 and -1
s = -1 + 2*randi([0 1],100,1) nnz(s==-1) 100-nnz(s==-1)

3年弱前 | 1

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How can I plot graph in this relationship?
s=0; hold on for j=1:1:10 s=s+j; disp(['j = ', num2str(j)] ); disp(['s = ', num2str(s)] ); plot(j,s,...

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Array Problem How can I unpack an array? why the firt element pf my array is always 0?
We don't know how you call the function - so we cannot predict I1, I2 and I3. To your second question: I = [3 5 -6]; [I1,I2,I...

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Integrate pressure over area, from dataset points
Maybe you want to get mean pressure over the face. In this case, divide "sol" by area = pi*(5^2-1^2) as done below. x = load("x...

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Why do I have an error with minus sign
There is a minus sign in front of d^2M/dx^2 which is difficult to see. So everything is ok: f_0*(x/L)*(1-(x/L)) = -(f_0*x*((x/L...

3年弱前 | 1

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Out of memory - dsolve 3rd order system
Does this one work better ? syms t y1(t) y2(t) y3(t) f = 10*exp(-t); eqn1 = diff(y1) == y2; eqn2 = diff(y2) == y3; eqn3 = d...

3年弱前 | 0

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Solve these unkowns x and y using these 2 simultaneous equations
I think you want to use sind and cosd instead of sin and cos. This is a linear system of equations in m3R3L3 and m4R4L4. You kn...

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How do I include or make a discrete variable for an optimization problrm?
Make a loop over the 4*4*3*3 = 144 possible combinations of x1,x2,x3 and x4 and only optimize with respect to x5, x6 and x7. In...

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I want to solve these 2 simultaneous equations to get x and y
syms x y equ1 = 73*sind(0)+92*sind(200)+87*sind(x)+65*sind(y) == 0; equ2 = 73*cosd(0)+92*cosd(200)+87*cosd(x)+65*cosd(y) == ...

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i was calculate using gauss jacobi method with 4x4 matrice, why does NaN appear? what should i do?
A(2,2) equals 0, but you divide by 0. What is H ? clc; A=[1 3 1 -1; 2 0 1 1; 0 -1 4 1; 0 1 1 -5]; A=[A(2,:);A(1,...

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Index in position 2 exceeds array bounds (must not exceed 25).
Without seeing your data, I'd speculate that spec001 has only 25 columns, but that you try to address columns up to the index 20...

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Problem with time plot from partial derivative equation solved by method of lines
It's "Conversion", not "Convertion". And setting a boundary condition at z = L is incorrect because you only have convection, n...

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How do I define piecewise constant function in for loop?
Give the correct values to the arrays "left_limit_of_ith_interval" and "right_limit_of_ith_interval" in the following code: lef...

3年弱前 | 2

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