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Can I get rid of this for loop with vectorization?
Try the following: G_max_chl = 20; % Maximal conductance of chloride G_max_glu = 30; % Maximal conductance o...

5 years ago | 1

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Write out the values of a vektor as corresponding variable name
Try help int2str

5 years ago | 0

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Help solving directional cosines
Don't the eigenvectors give you the principal axes? [V,D] = eig(A); Details: doc eig

5 years ago | 0

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Return only the positive values to be used in subsequent eqns
Why not use g = 32.3; v = sqrt(3*g/(2*cosd(45)*sind(45))); t = 2*v*sind(45)/g; which will give you positive values immediat...

5 years ago | 0

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fplot() for three functions
Try using limits, e.g. fplot(@(t) 16/3*exp(-2*t)-4/3*exp(-8*t), [0 20]); Also use t.*exp(...etc) not t*exp(...etc)

5 years ago | 0

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Answered
Unable to perform assignment because the left and right sides have a different number of elements.
You have some missing indices in calculating some of the k1 and k2's. You also need to set hold on to get all three methods on ...

5 years ago | 0

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Answered
Why wont my code stop running?
Not totally clear what you are trying to do! Are you integrating wrt x or t? The solution to dy/dx = -x/y is x^2 + y^2 = r^2 ...

5 years ago | 0

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performing iterations until equation becomes zero
Shouldn;t your first few lines here be: N = 0.1:0.1:5; for i=1:numel(N) No=(Ns+R*N(i))/(1+R); ...etc

5 years ago | 0

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Error in ODE45.
You have missed the m in your first global delaration. You should have global g CdS m rho uvw not global g CdS rho uvw

5 years ago | 0

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a multivariate quadratic function
Here's one way. It uses an initial guess for each element of P, q and r, then combined them into a single column vector which i...

5 years ago | 0

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Answered
Dubble sin in first order Differential Equation
Should be like this >> h = 0.01; begin = 0.0; finish = 5; % Don't use end here as that's a reserved word in MATLAB x = beg...

5 years ago | 0

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Random Walk Simulation for Multiple Particles
Do you mean like this: % Simulation of a random walk (delta = 1, tau = 1) rng('Shuffle') trials = ...

5 years ago | 0

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finding probability in Matlab
You could use a Monte-Carlo simulation approach. Building on your calculations we have, for example: % Monte_Carlo calculation...

5 years ago | 0

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Systems of equations (help me please)
You have four equations for 3 unknowns. You don't need eq3. It's immediately obvious from eq1 that l2 = 0; surely you don't n...

5 years ago | 0

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How to use iterations in solving system of equations? want to update the vector Y at each iteration but ending up with same Y defined in the beginning.
Try taking Y = (-eta.^2+1); outside the while command.. i.e. have Y = (-eta.^2+1); while change >1e-15 ...etc

5 years ago | 0

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Answered
Second order ODE - BVP
I used an alternative method that makes use of Matlab's fzero function. You can also see one way of avoiding the problem at x ...

5 years ago | 1

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Second order ODE - BVP
You start at xlow = 0, but your function bvp5ode has an x in the denominator. bvp4c doesn't like it when this is zero! If you ...

5 years ago | 1

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Including a periodic piecewise function of time in coupled ODE
Because eta is itself a function of x, you need to have dA = @(x,A)[-eta(x)*(maxBeta/2)*ks*ki*A(2)*A(3)*exp(-1i*delk*x) + ((k2...

5 years ago | 0

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How can I use values from datafile as a time dependent function in ODE system?
Use interp1 to interpolate values between data points. doc interp1

5 years ago | 1

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How to generate 8 random 2D coordinates that do not duplicate?
How about P = randperm(64); [I,J] = ind2sub([8,8],P); x = I(1:8); y = J(1:8);

5 years ago | 1

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Euler's Method
Since you are given velocity as a function of time, why don't you simply plug the desired values of time directly into the funct...

5 years ago | 0

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Help with ODE45
global g % The value of g must be specified before using it in the function via ode45 g = 9.81; options = odeset('AbsTol',...

5 years ago | 0

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How to solve first order ODEs to find four components (for velocity and displacement of projectile in X and Y directions)?
A little more like the following perhaps (it can all be done in one file): %Primary Conditions tspan=[0:0.5:4.5]; %Period...

5 years ago | 1

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Trouble finding solution of unknown variable in difficult integration problem
I used a different approach - see below. I could only see an increase in h, with increasing s, as a step change around s = 4.5....

5 years ago | 0

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differential equations of the type Q(t,h(t) where h(t) is based on volume
Does this help: g = 9.81; % m/s^2 c1 = 0.82; c2 = 1; Hspill = 3; % m Lw = 3; % m ...

5 years ago | 0

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Answered
How to plot a trigonometric function and a linear functions on the same graph to work out solutions to trigonometric equations?
Try plot(t,y1,t,y2*ones(size(t))) for example.

5 years ago | 2

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Answered
matching matrices that correspond to each other in a graph
Do you mean something like this (I'll leave you to play with the colours): correspond = [0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 ...

5 years ago | 0

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Answered
How can I implement recurrence relations to find polynomials?
Do you mean something along these lines: order = 4; a = [0, 0, 1.3, 1.4, 1.5]; % Obviously, replace with your own values. ...

5 years ago | 0

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Answered
Running the code takes too long to finish(Euler's Method)
Remove syms dh(t,h) and replace dh(t,h)=(K1+K2*sin(5*C*t)*cos(C*t)-rho*A_pipe*(2*g*h)^(1/2))/(rho*A_tank); with dh = @(t,h...

5 years ago | 1

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Answered
How to change the font of a pie chart?
You can do it from the Property Inspector after the program has finished.

5 years ago | 1