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How can I guarantee data is placed into the correct spot in a matrix?
He (Doug) means tyhe indices in MATLAB start from 1 not 0. So you have J(1,1) as the first element and J(0,0) returns an error. ...

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Generating code from simulink
Which target are you generating code for? (grt or ...?) You might want to reduce the model by removing the blocks and signals...

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How can i save multiple variables in a text file, including the variable names
myfilepath = 'C:\myfile.txt'; fid = fopen(myfilepath, 'wt'); fprintf(fid, '% this is the beginning of my file'); fp...

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TLC equivalent of find_system(...)
For Target Development/ code generation, I need to edit the ert_file_process.tlc file. In this file I need to write a few lin...

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rearrange system of equations
You could use the Simbolic Math toolbox and its commands to do all these. syms, subs, vpa would be commands in Simbolic Math to...

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How to create a vector?
vector=[]; for j=1:n % find newone that comes from file(j) vector = [vector , newone] end

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Iteration of Matrix in equation
Write a for loop and then iterate n times like this: n=5; number_of_states=12; A = ones(12,12); B = ones(12,1); x=...

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find the line equation of two points in 3D
To find the intersection of two lines (curves) for which you have numerical data, like f(n) and g(n) you can first compute h(n) ...

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How to get the area between two curves?
You can integrate the difference between two curves to get the signed area between them. If you are looking for an unsigned a...

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can any one send me a code?
Look into the File Exchange section.

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How can I generate a Command Window error from Simulink block mask editor (Initialization Tab)?
disp() command would display whatever you want to display in the command window.

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Adding New Menu in SImulink
Yes it is possible. Look up sl_customization(cm) on MATLAB's documentation. You need to write a function whose name must b...

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Copying and replacing of some values
a=[1 5 7 11 14 15 16 12 90 33 46 78 79 66]; b=[2 8]; n=3; c = a; for j=1:length(b) if length(a)>b(j) index ...

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ode23s, ode15s, what to use?
As for the discrepansy of ODE15s and ODE23s or ODE23tb 's responses, I would suggest you to integrate the equations for a very s...

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How to display the Xticks from the command line?
x = -pi:.1:pi; y = sin(x); plot(x,y) set(gca,'XTick',-pi:pi/2:pi) set(gca,'XTickLabel',{'-pi','-pi/2','0','pi/2','pi'}) ti...

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How to customize a Built-in PID Block?
You don't want to edit Simulink's Built in blocks. Instead you want to create your own custom blocks. You could do it with cr...

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bisection method - can't see error in code
In the while loop while abs(m)>epsilon ; if Fb*Fm <0 a=m else b=m end end you are no...

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Which is a better approach to solve the following set of equations?
In regards to the time step, you can use any ODE solver but determine the time step to be in the form of linspace(0,100,51)...

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Cross section plot for 2D plot
Do you need to find the intersection of a 1D line and a curve that has been plotted in a 2D plane? Did I understand your pro...

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How can I calculate the number of data points within the area of a cirle
Here is how you do it for numbers in a circle: x = [6 -5 -2 3 -1 0 2 1 8 -12 7 6 -6 5 -7 41 3 ]; y = [3 2 -4 -4 -1 77 8 ...

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How can I calculate the number of data points within the area of a cirle
data = [25 4 -10 -8 20 -5 -15 2 12 22 1000]; range = [-10 10]; % data-range(1)>0 % data-range(2)<0 sum((data-range(1)...

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Minimize function by choosing a variable that enters indirectly
I wouldn't use an inline function like @(Bbin)... for this case. I would do it this way: Write a function like this: (untest...

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Error message for tspan in ode45
You get this error when your timespan is incorrectly set up. Example of incorrect timespan: [0 0] [0:0.01:10 9] Corr...

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nonlinear differential equation system
If you are trying to solve it numerically with some numbers as initial conditions, you can use MATLAB's built in ODE solvers lik...

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Usage of SUBS for the calculation of the intersection of a circle and an ellipse
first, your equation involves CAPITALIZED T while you are trying to solve it for little t. You need to stay consistent. secon...

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problem in return code
"return" command, ends the execution of the code. "return" does not mean that the code is going to start from the beginning ...

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Explicit integral could not be found.
Mathematica finds the indefinite integral of f over x <http://integrals.wolfram.com/index.jsp?expr=x%5E3*exp%281%2Fx%5E2%29*%...

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How to construct a table with several matrices
mytable=cell(2,2); mytable{1,1}=[1 0.5; 0.5 1]; mytable{1,2}=[1 -0.5; -0.5 1]; mytable{2,1}=[0.4 1; 8.0 2.0]; ...

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immense difference between continous and discrete state space model
I edited your code: Ra = 2.06; La = 0.000238; k_phi = 1/((406*2*pi)/60); J = 1.07e-6; ...

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solution for integration of following expression.
A general form for the indefinite integral of your problem does not exist. Take y = exp(a*x) and transform the integral over ...

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