# Aquatris

Last seen: Today Active since 2023

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Add NaN in the first row of a table
Assuming all your entries are numeric, since you want to assign NaN, here is one way; % create dummy table Age = [38;43;38;40;...

11 hours ago | 0

Error in displaying the whole matrix
Ther eis probably a 1e6 at the top of the display. You can do 'format bank' to mitigate this if you want or any other format opt...

24 days ago | 0

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How to update a function with output from another function?
Here is one way iff the required variables are within the state vector 'y', then you can do: %% change ode45 call [t, y] = ode...

28 days ago | 0

slow drawing of a set of points on a plane
In essence for loop are always slower. So try to vectorize your code whereever possible for efficiency, here is a good read. In ...

28 days ago | 0

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plot magnitude data at location (x,y,z)
Here is one way where you use colors to indicate the magnitude; % random data x = [0:pi/50:10*pi nan]; % nan is added to remov...

28 days ago | 0

Generate the motion (Trajectory) of a sphere (or point) with given velocity value
If you dont care about the actual timing and things, here is one way where the colors of the path indicate the speed and a simpl...

29 days ago | 0

How to generate vector with non-linear spacing?
The answer from another question here: A = 1; B = 5; std = .9; % need to play with this to get desired shape within desired r...

1 month ago | 0

Second Order Laplace solving doesn't work ('Unable to find explicit solution')
Not sure the underlying reason behind it but you are defining the X as a function of s and solve function seems to be having tro...

1 month ago | 0

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How do I solve system of differentials using ode45 and eom functions
You defined a symbolic variable within your ode function, which is a nono if you wanna solve it numerically :D function ds = e...

1 month ago | 1

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Solving with ode45 with a solution dependant variable in the ode
No, you should not do it that way. Instead you should create your function properly in a way that represents the equations. It w...

1 month ago | 0

How to display a color bar in Matlab as shown below
You can call the colorbar function with the desired tick values Z = peaks; contourf(Z) colorbar('ticks',[-6:0.5:8])

1 month ago | 1

Error in for loop: Index exceeds matrix dimensions.
You have essentially made two mistakes: matrix_f only has 6 rows. You setup up your for loop such that k is 1 2 3 4 5 6 . When ...

2 months ago | 0

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Friend Function implementation in MATLAB
You can use the Access List property. Here is more explanation. Here also.

2 months ago | 0

how to do rising and falling edge in single signal using signal builder..?
Click on Signal->ReplaceWith or New->Square and play with the points. Alternatively, click on Signal->Custom-> enter your time...

2 months ago | 1

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You can specify sample time of each block seperatly. Here is more information and how to do it for different blocks, subsystems ...

2 months ago | 0

How to loop through cell array and apply script to each double?
You can use the cellfun function, where you use your script as the function. Example: a = {1:3, 200:205, 10:12}; new_a = cell...

2 months ago | 0

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)

2 months ago | 1

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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(...

2 months ago | 0

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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]; ...

2 months ago | 0

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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...

2 months ago | 0

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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...

2 months ago | 2

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...

2 months ago | 1

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...

2 months ago | 0

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,...

2 months ago | 0

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...

2 months ago | 0

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...

3 months ago | 1

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...

3 months ago | 0

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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 ...

3 months ago | 0