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problem in creating function file using ode45
Are you looking for something like this? (I might have misinterpreted your equations!) O=1; a=pi/2; g=9.81; L=100; tspan ...

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how can eliminate negative data in erf function?
Should term2(i) = (sqrt(lemdaD)./(2.*e1(i))).*exp(-(v1(i).*sqrt_avgsnr - v2(i).* mu).^2./(2.*e1(i).^2)).*.... erf((e4(...

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Answered
Why is my plot not showing for improved Euler method?
You need to keep track of each step. Your original simply overwrites the values of t and y at each step. dy=@(t,y) -(0.1/10^(1...

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Why I couldn't plot this graph f=(@(x,y) (x.^2)+(x*y)+(y.^2)<=68200.^2/3);
This will give you the outline (I've assumed you want 68200^(2/3) rather than 68200^2/3) f=@(x,y) x.^2+x.*y+y.^2-68200.^(2/3); ...

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I want to solve a simple "y=mx+c" with initial condition to find value of "m" and "c" but i am getting error by using following code. Any idea to tackle this kind of problem?
These are simple linear equations in m and c so set: X = [x(1) 1; x(2) 1]; Y = [y(1); y(2)]; and solve using X\Y to get m a...

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I have been trying to code a solar pv module for 1 diode model, the following is my code, can someone tell me the mistake ive made and the correction to it pls.
Like this? Note: I've made kref positive to avoid the I's being complex. This might be completely incorrect!! Pmpp = 50; ...

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Reorganization of data in matrix
Like this? M = [1 1 0.270588872500870 1 1 0.191034400222846 1 1 0.316821350897659 1 1 0.391794699189989 1 2...

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LogLog Plot is Blank
Like this? (I've assumed you want log base 10 everywhere): %Paschen Curve Plotting for H2 p = 1.2; %Torr d = 20; %cm GamSE ...

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How to combine multiple numbers into 1 number?
Do you mean R1 = 2; R2 = 4; Zr1 = [0 0 0]; R = R1*10^4+R2*10^3+Zr1(1)*10^2+Zr1(2)*10+Zr1(3) Alternatively: R1 = 2; R2 = 4; Z...

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Runge Kutta Fourth order and Interpolation
Shouldn't f1 = @(z,r,ed,p11,m11) -(ed+p11)*z*m11.^3 *((r+1)./(((ed+p11)*(r.^2 +z.^2).^6) -(r/p11))) ./(2*pi*(r.^2 + z.^2)) ; ...

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Newton Raphson method for a system of non-linear equations?
Here's a simple example for you to follow: % Functions f = @(x,y) x^2 + y - 5.94; % i.e. the equation is x^2+y=5.94 g = @(x,...

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No feasible solution in optimisation in linprog
I don't know if this will fix your problem, but I think the first number in the second row of A1 should be 8 not 2.

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Simple relaxation method Matlab
For the simple relaxation technique to work the A matrix needs to be diagonally dominant. Your A is not diagonally dominant - s...

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Solve a system of 3 second order equations
Write your equations as 6 first order equations like so: where I've assumed you have pre-defined omegaout and thetaout as fun...

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Unable to solve nonlinear equation using fsolve as the message shows No solution found
fminsearch makes a reasonable attempt: F1 = @(a,b) -9.135789053E+00-log(a)+166.2509975*a+5.84074229*b+... -166.2509975*a^2...

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How to solve and plot this set of differential equations?
If rho starts at 0, then drho/dtheta will be zero and rho will not change from zero according to your first ode. If rho and drh...

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How can I add two differential equations to the system in a given time interval?
Like this? (though I'm not sure I've interpreted which constants apply during which interval correctly!) Tspan = 0:30; C0 =...

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How do I plot Rosette-like diagram in this case?
Something like this? data=[10 10 30 100; 20 50 70 150; 30 45 60 120]; theta0 = deg2rad(data(:,2)); thetaf = deg2r...

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Iteration of multiple nonlinear functions
Here's a quick and dirty way. I'll leave you to modify the following to record all the temperatures at every step. %Given valu...

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converting table values to RPM
B{:,7}./(2*pi)*60

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using num2str for subplot titles
Try title(['Q1S', num2str(k)]) i.e. enclose the two terms within square brackets.

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control and simulation of petroleum distillation column
The following works, but probably doesn't contain all the right data or equations! % CALCULATE MATERIAL BALANCES FOR THE DISTIL...

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Answered
Error with plot command
You haven't specified function atten_func_dist, so we can't run your code to test it. You specify fre as a constant, then us...

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Answered
How to combine multiple curve fits in one plot
Use hold on after plotting the first figure

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How to represent [airfoil] coordinates as a polynomial
How about using a spline fit? After loading your data and calling the first column x and the second column y try xfit = linspa...

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1D melting problem with Neumann's analytical solution
eps is a built-in constant so better not to use it as a variable. Your png files show it is xi not epsilon. Try the following ...

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Answered
Overlay plots of different angles of incidence.
Remove the word figure and add hold on after the plot grid on [Fr,In] = meshgrid(Frequency,Incident); plot3(Fr,In,Reflectivit...

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How can write in MATLAB the following expression?
Try ket0 = [1; 0; 0] ket1 = [0; 1; 0]

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I don't understand why does it give error?
Put the functions at the end. Tidy up one or two minor errors to get: %########### BF-PSO.m file ############# %####### Butter...

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How to count steps represented by the acceleration data given in text file?
Like this (you can plot the other two - look up help on subplot): M = csvread('walking.txt'); x = M(:,1); y = M(:,2); z = M(:,...

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