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Aquatris


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Answered
Unable to obtain double precision from symbolic value
You need the vpa function x = 2; a = sym(1/3); f = a*sin(2*pi*x) fVpa = vpa(f,10)

5 days ago | 1

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Answered
Help with contour plot
You actually do have 5 lines but they are on top of each other thats why you do not see them. So your Z matrix for k1(1) and k1(...

5 days ago | 0

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Answered
count number of elements for each slice of a vector
Here is one simple way: A = [2 1; 3 1; 4 2; 5 2; 6 2; 7 1; 8 1; 7 1; 5 2; 6 2]; ...

12 days ago | 0

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Answered
First cell in a string array is empty, how to replace this?
The issue is you are not initiating and filling the mode1_status matrix properly. Your initial mode1_status matrix is a 1x1 matr...

12 days ago | 0

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Answered
Which MATLAB license should I buy as a reseacher working in an NGO?
The best way to know is by contacting the sales directly, say it is a nonprofit NGO and for research. They might offer you eithe...

12 days ago | 2

Answered
Matlab optimization - variables to satisfy L1 norm
You create a nonlinear constraint functio and give it as an argument to the fmincon. [x,fval,exitflag,output]=fmincon(@(x)costF...

13 days ago | 1

Solved


Calculate area of sector
A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area. Area of sector A is defined as 0.5*(r^2...

13 days ago

Solved


Pizza!
Given a circular pizza with radius z and thickness a, return the pizza's volume. [ z is first input argument.] Non-scored bonus...

13 days ago

Answered
How to draw a Nyquist plot while avoiding the pole at the origin
I dont think the nyquist plots looks exactly like you draw by hand. You can set the axis limits to make the nyquist plot visib...

14 days ago | 0

Answered
How to draw a graph like the image attached below in MATLAB
You can also use countourf function; % random data from countour example x = linspace(-2*pi,2*pi); y = linspace(0,4*pi); [X,...

15 days ago | 0

Answered
Insufficient number of input parameters.
The calculate_gain_sfunc requires an input. You called it without any inputs. calculate_gain_sfunc % WRONG way to run the func...

15 days ago | 0

Answered
Hi All. Just wondering why answer to (i) is not 4.9e+4. an why answer to (iii) is not (9x)/2 or 4.5 x. Many thanks. Brian
Your value in (i) for f(1.2) is 49020.80113638172, so when you round to 1 decimal, it becomes 49020.8 which in engineering notat...

17 days ago | 1

Answered
How can I express all the variables Vcm1, Vcm2, Vcm3, Vcm4 in num2str without getting an error?
Dont know what exactly you are trying to do but here is an example using your variable names: dim = [0.2 .5 0.25 0.1];% normali...

18 days ago | 0

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Answered
Intersection condition between two ellipses
Here is one way where accuracy will depend on selecting the threshold correctly. You simply solve the equation for y given an x ...

18 days ago | 0

Answered
Index exceeds the number of array elements. Index must not exceed 1
You are overwriting the C_Y array in your for loop. You initialize C_Y as a 5x5 zeros matrix and in the first iteration of your ...

18 days ago | 0

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Answered
help with nested loop and plot
Here is one simple dirty way: n= 101; x = linspace(-100, 100, n); y = linspace(-100, 100, n); [X, Y] = meshgrid(x, y); Z = ...

20 days ago | 0

Answered
Accessing cell array entries using arrays
I think you want to use B columns as indeces to extract info from A, so: A=cell(2,2); B=[1 2 2 1 1; 2 1 2 1 2] A{1,1}=[4...

22 days ago | 0

Answered
what is the meaning of error "Index exceeds the number of array elements. Index must not exceed 8."
it means the size of y variable is 8 abd you are trying to get 9th 10th 11th index of the y vector. This is because your initial...

22 days ago | 0

Answered
Someone help me to plot Ids vs Vds for HEMT AlGaN/GaN
I think what you are trying to do is vary Vds and see what Ids becomes. So here is a simple some modification for it using for l...

24 days ago | 0

Answered
Generating triangle wave form
You can use the general equation for the triangle wave and implement it using simple simulink blocks t = 0:0.01:10; % time f =...

24 days ago | 0

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Answered
How to use fminunc for a 2D function composed of two functions?
You dont seem to have a double function. So here is a code to solve your problem. You have local minimas so fmincon and brute f...

24 days ago | 0

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Answered
the matrix addition should come 0 but it is not happening
Given the difference is 1e-12, it is probably floating point issue. Floating points list significant bit is generally unreliable...

25 days ago | 1

Answered
How can I make such that every method call to a class is routed through a wrapper
Any reason why you are not using wrapper_func with an input argument that determines which method it should call? With this you ...

25 days ago | 0

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Answered
Can't stabilize system with PID
One thing you can do is use symbolic PID gains, plug them in your closed loop transfer function, and find the values via pole pl...

26 days ago | 0

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Answered
How to set upper x-axis ticks values and locations?
You were changing the label name at 30 60, instead of their actual values, so here is one dirty way but I recommend you follow t...

28 days ago | 0

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Answered
finding non zero solution for homogeneous system of equations
Since zeros(7,1) is kind of a solution for you, you should select your initial value away from that point. Below you can find a ...

28 days ago | 1

Answered
Matlab plot is drawing an individual line to each data point
You have a lot of 0s in your nc and x vector, hence you go back and forth to 0 position. You can see this if you use a data poin...

29 days ago | 0

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Answered
Strange behavior when initializing empty cell in struct()
If you want to define the property as empty, then you should use '[]' instead of '{}'. obj = struct(MyProp=123, MyOtherProp=[])...

1 month ago | 1

Answered
I want to calculate the eigenvalues form the very huge sparse mass and stiffness matrix.
If eig() function is taking too long, you can use eigs() function. Example from mathworks eigs() site: A = delsq(numgrid('C',1...

1 month ago | 0

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Answered
How to nest and call the fmincon function in Simulink?
EDITED: to fix the initial_values to be a 3x3 matrix instead of lambda Your issue was in the line initial_values=[lambda(1,1)...

1 month ago | 0

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