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Mischa Kim


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MathWorks

1 124 total contributions since 2013

Networker, learner, educator
Professional Interests: Spacecraft dynamics and control, numerical analysis, simulation, animation

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Answered
How to count the number of different strings in a string list?
Hi, use str = {'AAA','ABB','CDE','ABB','CCR','AAA','FDR'}; numstr = numel(unique(str))

ungefär 12 timmar ago | 0

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Answered
How to extract value at a given time in ode 45
Hi Shubham, use an events functions, see the example below. With events functions you can identify zero crossings; in your case ...

ungefär 17 timmar ago | 0

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Answered
Draw a circle on matlab app designer?
Hi ErikJon, if the plot input is a matrix (e.g. your circ) "...the plot function plots the columns of the matrix (circ) versus t...

en dag ago | 0

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Answered
please help me (dsolve)
Use instead syms y(t) eqn = diff(y,t,2) + 0.5*diff(y,t) + y == 3; Dy = diff(y,t); cond = [y(0) == 0.5, Dy(0) == 0]; w ...

2 dagar ago | 0

Answered
confusing ode suits for solving discontinuous odes
Hi, this is because the integrator, ode45, adjusts the integration step size. Broadly speaking where the dynamics is more comple...

3 dagar ago | 0

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Answered
How to Find average value for every 10 sets of a matrix
Hi Magdy, you could use something like: x = 1:1:12; % this would be your matrix A y = reshape(x,3,4) m = mean(y,1)

3 dagar ago | 0

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Answered
How to Use "Ask a Question" Section Correctly?
Hi Ercan, thanks for flagging this. I have seen the same behavior this morning in Chrome, other browsers seemed to work fine. I ...

5 dagar ago | 3

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Answered
ODE Event Location detecting events other than zero
Hi Hariharan, yes it is. You simply define a function that is equal to zero whenever your expression equals a certain value. Fo...

5 dagar ago | 0

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Answered
How do I change the values for x-axis ?
Hi Anne-Lise, do you mean changing the tick labels? See this answer. If this does not address your question, how exactly do you ...

5 dagar ago | 0

Answered
Why is the resulting time-domain curve from Euler method and ode45 not stable?
Hi Ni Made Ayu Sinta Dewi, there is nothing you are doing wrong. What you are seeing is expected behavior. This is because you a...

5 dagar ago | 0

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Answered
ode45 fail with pendulum
Hi Bobby, this is the wonderful world of numerical (vs symbolic) computation. ode45 is a numerical integrator that approximates ...

5 dagar ago | 0

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Answered
Changing Length of Pendulum while it is in motion
Dear Yan Koon Ang, this is possible. In the example you are referring to in your question you would have to make the time varia...

7 dagar ago | 1

Answered
I am trying to plot x and y with y being the only unknown but I don’t what is wrong in my code please help
Honore, the one thing I notice is that x and y are vectors. Rewrite the y-equation using the dot operator, .^ instead of just ...

8 dagar ago | 0

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Answered
Finding the initial conditions which give a specified event using ode45
Patrick, as Walter pointed out this is a BVP. However, you can and I personally would use ode45 and the so-called shooting meth...

8 dagar ago | 0

Answered
Differential equation by simulink
Double-klick on the integrator blocks and you'll see that the default initial condition is zero (0). It is also inside the integ...

8 dagar ago | 0

Answered
when i run the code the plot graphs appears empty here is the code please help to find the mistake i made
Seif, I believe this is what you are trying to do: %calculating velocity V3 = 10; % velocity of the piston in cm/sec %global...

9 dagar ago | 0

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Answered
How to change a Function by a Variable
Ercan, here you go, for the first term: syms phi x A B eq = A*sin(phi) + B*cos(phi) eq = subs(eq,sin(phi),2*x/(1+x^2))

9 dagar ago | 1

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Answered
How to write Newton method with exact number of iterations and see all digit ? for example if method is required to take exact 5 iterations of newton's method
Add a loop index, e.g. ii. Also, you set your code as a function. This means you can call it, e.g., from the command window usin...

9 dagar ago | 0

Answered
serie with two parameters
Sara, it really depends on what you are trying to achieve. For starters you could use two for loops to take care of the summatio...

10 dagar ago | 0

Answered
Plotting a function with 2 dependent variables
Use meshgrid instead: [x,y] = meshgrid(-10:0.1:10); z = sin(x).*cos(y); plot3(x,y,z)

11 dagar ago | 0

Answered
How to plot streamlines continuously?
Not entirely sure what you mean. Changing startx and starty values? In your code you set the starting values on the y-axis to 0....

13 dagar ago | 1

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Answered
ode45 solver SIR model
Hi Ollie, to get the area under the curve, just add another integration variable that integrates over the curve, y(2), I called...

13 dagar ago | 0

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Answered
Extracting specific parts of an array
Assuming your variable is called data_velocity use something like: extractdata = data_velocity(data_velocity<0.1 & data_velocit...

13 dagar ago | 0

Answered
Simple For cycle (a small problem with the indexes)
There you go: omega_vet(1) = 55000; for i=1:length(phi_10(init:end)) x_ER_vet(i) = interp1(mass_flow_turbine_cor...

13 dagar ago | 1

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Answered
How can I get the first zero maximum in my program?
Georges, you could use something like this to find your first zero: b(find((abs(a)<1e-12),1)) Of course, this is assuming, for...

13 dagar ago | 0

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Answered
Displaying actual values from coded values for a for loop.
Wiktor, simply replace the is_leap_year(i) command with an if statement. Quick and dirty: if (strcmp(is_leap_year(i),'True')) ...

13 dagar ago | 0

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Answered
question about fplot function
Hi Kris, syms y(x) Dy = diff(y,x,1); DDy = diff(y,x,2); ysol = dsolve(DDy + 3*Dy == 12*x - 5, y(0) == 1,Dy(0) == 0) fplo...

14 dagar ago | 0

Answered
Sorting array by datetimes does not work
Convert to and sort the table: T = sortrows(cell2table(HR_date_time_strings),2)

15 dagar ago | 0

Answered
Turning my function into an infinite loop
Hi Faris, instead of a for loop use a while loop with a condition like while abs(s_k - s_k1) > TolMax % here comes your co...

15 dagar ago | 0

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Answered
How long do I have access to Matlab on a Academic license?
Matthew, your academic license is good for one year starting from the date the license has been purchased. Contact me directly a...

15 dagar ago | 1

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