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# Mischa Kim

### MathWorks

1.070 total contributions since 2013

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

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Splitting a matrix into submatrices by value
Something like this? A = [2 3 0 3;... 3 2 1 3;... 2 2 1 2] A = 2 3 0 3 3 2 ...

fast 2 Jahre ago | 1

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How can I solve this transcendental equation graphically?
Timaway, define a vector |Xi|, e.g. using the |linspace| command. Then plot |tan(Xi)| and the right side of your equation into t...

fast 2 Jahre ago | 0

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Converting Matlab code and graphs into Latex
Hi Muhammad, there are a couple of packages on File Exchange, e.g. <https://de.mathworks.com/matlabcentral/fileexchange/8015-m-c...

fast 2 Jahre ago | 0

solving a second order linear differential equation
Almost there: g = 9.8; l = 0.5; t_span = [0 30]; teta0 = deg2rad(60); tetad0 = 0; F = @(t,q) [q(2);-(g/l...

fast 2 Jahre ago | 0

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how to plot the phase portraits of a onlinear dynamics of rock-paper-scissors game model
Hi Cui, there are two steps you need to take to get to your desired result: # Solve the differential equations (DE): Essentia...

fast 2 Jahre ago | 0

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matlab giving complex number when the expected answer is a real number?
Note: >> (-1)^1.5 ans = 0.0000 - 1.0000i which is not the same as >> -1^1.5 % = -(1^1.5) ans = -1

etwa 2 Jahre ago | 2

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Why don't i get a vector for phi1?
All constants need to be defined. Then use: t = pi/2:0.01:2*pi+(pi/2); phi1 = (a^2+a^2+d^2+2*a*d*cos(pi-t)-d^2)./(2*b*...

etwa 2 Jahre ago | 0

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How do I display individual values from an if statement in a messgae?
Hi Matthew, I assume you are using a loop to do the iterations, most likely a |while| loop. If you say you can print only all th...

mehr als 2 Jahre ago | 0

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Submitted

RLC circuit demo bundle
Analyze the RLC series circuit using different modeling approaches and with hardware

Comparing two vectors getting results in the new one
V3 = V1 > V2

mehr als 2 Jahre ago | 1

WHY do I get this error
mahesh, is the above code all in one and the same script? If it is modify like this: [t,y]= ode45(@free25,[0 10],[0 0.09]);%...

mehr als 2 Jahre ago | 0

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Error in Matlab Fundamentals, 6.1 Project Review
Adam, thanks for bringing this to our attention. I will forward your information internally and make sure it is addressed as...

fast 3 Jahre ago | 0

How do I count how many iterations my root is in a smaller interval?
In each iteration you have two intervals, |[a,c]| and |[c,b]|. Compute the size of both intervals and use the last |if-else| con...

fast 3 Jahre ago | 0

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i need to find variable x and the error is " Undefined function or variable 'x'. "
A couple of things. In the code you show |Ei| is not defined and it looks like you need to solve the equation for different |a|....

fast 3 Jahre ago | 1

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Help with error and coding.
One thing I noticed is the following: in your second while-loop you have while k<=24 x_c(k+1)=dist(k)*cosd(hr_deg(de...

fast 3 Jahre ago | 0

Function Generation Error (Not enough input arguments)
Store the function in a file called |deneme.m| and then execute in the MATLAB command window y = deneme(3)

fast 3 Jahre ago | 0

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Error RungeKutta method......not enough input arguments
Store |runKut4| and |fex7_4| in separate m-files and then execute [x,y] = runKut4(@fex7_4,0,[0 1],2,0.25); e.g. in the MA...

fast 3 Jahre ago | 0

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How do I insert a column with zeros in the second column of a mxn matrix?
Brute force: A = [1 2 3; 4 5 6; 7 8 9] A = [zeros(size(A,1),1) A]; A(:,[1 2]) = A(:,[2 1])

fast 3 Jahre ago | 1

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Is it possible that we can save .m file results with different name each time of execution?
@km, take a look at the documentation <https://www.mathworks.com/help/matlab/import_export/writing-to-text-data-files-with-low-l...

fast 3 Jahre ago | 0

Plot multiple subintervals in one figure
Joakim, is this what you had in mind? f=@(t,u)-u+sin(5*t)+cos(2*t); a=0; b=5; ua=2; % begynnelsevillkor t=linspace(...

fast 3 Jahre ago | 0

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eval([ans '=' num2str(x0(i)) ';']); gives an error "The expression to the left of the equals sign is not a valid target for an assignment". what could be the problem?
Just wondering if the following would do the trick... eval('ans = num2str(x0(i));')

fast 3 Jahre ago | 0

Is there a way to solve a system of ordinary differential equation with different time scale by using ode solver?
Ram, it sounds like you are referring to solving (possibly) stiff ODE. If you do, yes, there are solvers. See the <https://www.m...

fast 3 Jahre ago | 0

how to find min or max value in each row of a matrix and its index, if a matrix is 3x2 it will find the min in first row
Use [val,loc] = min(R') val = 21 35 42 % min value in each row loc = 3 1 1 % column locati...

fast 3 Jahre ago | 6

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Multiplication between 2 matrix
Danilo, use the Symbolic Math Toolbox syms B C a b c d A = [1 0; 2 3]; B = [a b; c d]; C = A*B C = [ a, ...

fast 3 Jahre ago | 0

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Can't figure out what's wrong with my code
Kevin, I see two problems with your algorithm/function |f(x)|: if f(xr)*f(xl)>0 needs to be if f(xr)*f(xl)<0 and ...

fast 3 Jahre ago | 0

VR Sink Parameter selection
Omar, you need to rename the |(Transform)| before you can access (that is, check the boxes of) the properties. You can do thi...

fast 3 Jahre ago | 2

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Help with splitting a string into a character array.
You could use s = 'Potato'; t = num2cell(s) t = 1×6 cell array {'P'} {'o'} {'t'} {'a'} {'t'} ...

fast 3 Jahre ago | 1

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Code returns, "Error using quiver3 (line 44) V and W must be the same size." How to fix this? The variables are the same size(1x25 double).
Aamna, based on your information I am not clear exactly what you want to do. However, the input arguments for coordinates and ve...

fast 3 Jahre ago | 0

From Scientific Calculator [Solve] to matlab
Alex, use something like fun = @(X) cos(X)^2*cos(3*X)^2 - 0.5; options = optimoptions('fsolve','Display','none','PlotFcn',...

fast 3 Jahre ago | 0