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How to plot a large data set with markers to differentiate two overlapping lines?
How about plotting every n points. For example plot(t(1:1000:end),n_d(1:1000:end),'o') hold on plot(t(500:1000:end),n_r(500:...

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there is also a mistake here i can't recognize it , please help
You need N = [-V3*cos(th3(ii))-40*W2(ii).^2*cos(th2(ii))+C(ii)*W3(ii).^2*cos(th3(ii))+V3*W3(ii)*sin(th3(ii)); V3*sin(t...

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How to vectorize this function?
You need a ./ (i.e. dot /) x3=@(phi) (R-((3-2.*sin(phi))./(1-0.5.*sin(phi)).*R)/4).*cos(phi) ...

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Plotting graph with Alpha and spectral radius
It works if you set i = 0.1:0.1:10. With i = 0; the inverse of S is full of Inf's.

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Conditional with time in ode45
Include upsilon within the odefcn mu = 6.25e10^-3; eta = 6.25e10^-3; beta = 0.03813350836; gamma = 0.01165323939; delta = 1...

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what's wrong with this code. why it show error can anyone tell?
You probably want something like this (don't enclose it with the statement 'function matlab' - that won't work). Remember to in...

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Plot with 2 parameters
Do you mean something like this: theta = -90:90; ri = 0.5; ro = 1.5; x = [ri*cosd(theta) ro*cosd(-theta) 0]; y = [ri*sind(th...

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Please, how can I solve runKut4 in line 6?
Try t = 0.0; tStop = 6.0; y = [1.5 0]; h = 0.1; [T,Y] = ode45(@dEqs,[0 tStop],y); plot(T,Y(:,1),'ko-') xlabel('time (s)')...

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ode45 function matrix dimensions problem
You need to loop through the Y_H values. See below global mu_H Ks X_BH teta Ss_in mu_Hmax=0.15; %days^-1 T=22.6; %centigrad...

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I am getting this error "Assignment has more non-singleton rhs dimensions than non-singleton subscripts". Please help. Mw, Cw and Kw are 243X243 matrices.
It gets past your indicated Error line for me, but fails because you haven't defined Mw, Cw or Kw.

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Error: Unable to perform assignment because the left and right sides have a different number of elements.
There are a lot of missing indices and definitions. In the following the indices are repaired; however, you will need to define ...

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Grading system in excel sheet based on marks
Shouldn't you have for i = 1:1:N if R(i)>=80 table.StudentGrade{i} = 'A'; elseif R(i)>=70 table.StudentGrade{i} = 'B...

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2D cylindrical boundriondition problem
It looks like vr = 0.8:hr:0.2; is the cause of the problem. This leads to vr being empty!

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I am trying to modulate the carrier with Gaussian pulse using frequency modulation. I tried to write this code. Can any one help is it correct, if not please can you help me in this regard. Thanks
Don't put a space between dot and ^ or dot and *. Also use figure, not figures. Try the folowing f = 12e12; % carrie...

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I tried to solve the code in R2015a but constantly getting errors:The following error occurred converting from sym to double.DOUBLE cannot convert the input expression into a double array. If the input expression contains a symbolic variable, use VPA
How about the following: %material property at the left end steel E0=2.1*10^11; G0=0.8*10^11; rho0=7.85*10^3; %material pro...

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problem with Euler's explicit methode
Because you have initial values of zero for L0=0;M0=0;Z0=0;N0=0; and they multiply the terms on the right-hand side of your f...

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Matrix dimensions must agree.
This works % n all alpha beta gamma min max d=[1 550 8.1000 0.00028 0 680 2 309 8.1000 0.00056 0 360 3 307 8.1000 0.00...

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When I attempt to run this code, it doesnt stop running. It will only stop when I pause it. Would appreciate any help as to how to fix this?
Your pressure goes negative just after a catalyst weight of 5 kg. Should it do this? Perhaps your equations should be double-c...

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writing and plotting function with multiple conditions
One possibility: f = @(x) 9/5*x*(0<=x & x<1/2)+9/5*(1-x)*(1/2<=x & x<=1); e.g. f(0.1) ans = 0.1800 >> f(0.75) ...

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Why is my plot figure blank?
You only calculate a single value of B. Presumably the x and y values should vary with nu somehow, but you don't specify how!

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design of journal bearing
Here's an example for l/d = 1/4. Note that because the S scale is logarithmic, it's best to interpolate logarithmically: S...

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Unable to perform assignment because the indices on the left side are not compatible with the size of the right side. how do I solve the problem?
Replace x_d(i)=[2*sin(2*t(i));4*cos(3*t(i))]; by x_d(:,i)=[2*sin(2*t(i));4*cos(3*t(i))]; Similarly for the others.

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Multiplying vectors resulting in unfinished answer
Use a./b not a/b for element by element division.

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Finding 0 in data for n X 2 array
Here's one way: ix = (M(:,1)+M(:,2))==0; M(ix,:) = [];

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solve multipe eq in a loop
Your equations are linear in p (p2 to p9, that is, since p1 is constant for all times), so the following is a simple way to solv...

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Evaluating a 2nd order ODE using the Runge-Kutta method
More like this: a = 0; b = 1; %n = input('Enter the number of intervals:'); n = 100; h = (b-a)/n; y = [2; -2]; t = 0:h:...

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How to solve this equation with matlab
Strange way of entering data! However, one way to find the friction factor is a simple fixed point iteration method, such as e...

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please help me with this
Simply insert hold xvals = [0 7.2 7.2]; yvals = [0.36 0.36]; plot(xvals,yvals,'--') after your plot command (though the pea...

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Equation of 3D motion with V, An, R
A little more like this perhaps, since you are given explicit expressions for velocities and accelerations (though note that ax ...

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Need Help Solving a system of 2nd and 1st Order ODEs
I think you should be passing only 5, not 6, parameters to your mysys function, which is better written as function dy = mysys(...

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