Community Profile # Brian B

Active since 2012

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Create an anti-identity matrix
Create an anti-identity matrix of given dimension. Examples n = 2 A = [0 1; 1 0] n = 3 A = [0 0 1; 0 1 0; 1 0 0...

9 years ago

Errors occurred during parsing of MATLAB function
The code you have posted may work just fine in MATLAB, but will not work in Simulink. Not all functions are supported for use in...

9 years ago | 0

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controlling what gets saved in command history
You could use the method described in <http://undocumentedmatlab.com/blog/changing-system-preferences-programmatically this post...

9 years ago | 0

How to assign user entered values(integers entered in an edit text box) to an already user entered string in a listbox of MATLAB GUI? . Your support would be very useful.
You are creating a struct correctly. However, you should also get the handle to the point when you create it: h = scatter3(...

9 years ago | 0

How to solve ODE with measured time series data?
The subscripted assignment dimension error is caused when you try to assign a vector of length 1651x1 to a 1x1 subarray of z_dot...

9 years ago | 1

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How do I connect points in a scatter plot with a line?
Don't use a for loop: x=[1,2,3,4,5,6,7,8,9]; y=[1,2,3,4,5,6,7,8,9]; hold on scatter(x,y,'X') line(x,y) o...

9 years ago | 2

Allocation problem using fmincon
The syntax for |fmincon| is WW = fmincon(F,x0,A,b,Aeq,beq,lb,ub) In your code, the initial guess |x0| is a 6x3 matrix, ...

9 years ago | 0

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Error in Using set_param
Try set_param('dummy/Constant','Value','50') Note that the value is also a string.

9 years ago | 0

Second Order Differential Equations
You can rewrite that system with a constant mass matrix |M|. That is, the system above is equivalent to M * d/dt[x1; x2; x...

9 years ago | 0

fmincon for optimal solution
So |F|, |lambda|, and |torque| are the variables, correct? Define |x = [F; lambda; torque]|. Then you can rearrange cons...

9 years ago | 0

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This is a linear regression problem, since it is linear in the coefficients. Assuming |E|, |H|, and |T| are column vectors, you ...

9 years ago | 1

How to define variables for nested functions
I assume |alpha| is a scalar variable. Then you can write |f|, |g|, and |G| as f = @(alpha) c11(alpha)*KI+c12(alpha)*KII; ...

9 years ago | 0

EXTRACT NUMBER FROM A COMBINED STRING AND NUMBERS
If the number is bigger than 9, you can make a slight modification to the answer by David Sanchez: output = str2double(St...

9 years ago | 0

how to separate the figures of specific number using matlab ?
Perhaps you want the characters converted back to numbers? If so, try n=123456789 str =num2str(n) strn = regexp(...

9 years ago | 0

How can I use xlswrite to specifically write to a cell as text?
I don't have MATLAB in front if me to test it, but you could try adding a single quote before the string, as in xlswrite(...

9 years ago | 4

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How to find the value of a variable in MATLAB that exists on both sides of th eequal sign?
If you have the Symbolic Toolbox, you can use: >> syms n q r >> solve('2*n+q=n+r','n') ans = r - q

9 years ago | 0

How to solve this without goto statement?
for(k2=1e3:1:1e5) for (w=18:1e-4:18.1) x1 = 1/(((-m1*w^2+k1+k2)*(-m2*w^2+k2) - k2^2))*k2*F*1; ...

9 years ago | 0

how to make a matrix grow inside a parfor loop?
You could make |S| a cell array in the loop, then create a matrix afterward: somefunction = @(x)deal(x,rand(1)<0.3); S=c...

9 years ago | 1

Submitted

Graphical editor for 1D Bezier polynomials
BEZEDIT(ALPHA) draws the graph of a 1D Bezier polynomial or arbitrary degree. Question

How can I run a model in rapid accelerator mode on Linux?
When running a model in rapid accelerator mode in Linux (RHEL 6.4), Simulink reports the model error "Unable to find an unused T...

10 years ago | 1 answer | 0

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How many times does each number appear?
Like Cedric, I keep thinking of iterating over interval length. Another way to look at the vector |b| is as the sum of the outpu...

10 years ago | 3

How many times does each number appear?
Jan Simon's solution is interesting because cumsum can be though of as an IIR filter, and so this idea can further improve the F...

10 years ago | 2

How many times does each number appear?
You can avoid saving all of the intermediate intervals (e.g., [1 2 3 4]) if you just want the count: a = [1 4;3 5;4 7;6 8]; ...

10 years ago | 1

I am not getting the plot graph for this equation.
Presumably you want array division instead of a LS solution. Try s=A+((B*exp(-1.001*((x.^2) + 100)))./((x.^2) +100)) % ...

10 years ago | 0

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Passing one element from array of structures
What is in |funct1|? If I define funct1 = @(s)s; then your code works without error.

10 years ago | 0

Not Enough Input Arguments in line 2
You need to call this function with an input argument, as in: sumcheck(1) Of course, this is just an example. I have no i...

10 years ago | 0

How can I sort an array of repeating elements
It depends how you want to store the sets. If you are comfortable with cell arrays, you can create one vector with the unique te...

10 years ago | 0

Help! me set the subscript indices properly so the function can perform while loop iterations
Indices start at 1, so j=0; ... while (1.00<r(j) r(j)<0.99) is referencing a value that does not exist (the 0th val...

10 years ago | 0

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