PetronasAMG

Last seen: ongeveer 2 jaar ago | Active since 2017

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Engineering student who needs a lot of help with matlab!

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Generating random angles between interval
How would I generate three random angles between (-pi to pi)? ex) q= [theta1 theta2 theta3], all theta are random numbers betwe...

ongeveer 2 jaar ago | 1 answer | 0

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Interpolation of missing matrix element
Hello, I am trying to interpolate some missing data of my 3x3 matrix, M = [43.13 0 42.88;0 39.32 0;41.81 0 43.27]; where 0s re...

ongeveer 2 jaar ago | 2 answers | 0

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Question

How to use spline interpolation to find intersection point of two lines.
Hi, Just new to matlab and still trying to understand spline interpolation. Although we can eye ball the interspection point, ho...

ongeveer 3 jaar ago | 2 answers | 0

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Question

Integrating a 2nd order ODE
I am given an equation, d^2y/dx^2 + q(x) = 0 x ranges from 0 to 1 and y(0) = 1 and y(L) = 1.5 where L = 1 and q(x) = 2*cos...

ongeveer 3 jaar ago | 1 answer | 0

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Question

how to linear interpolate using a for loop
say I have a y = x^2 -2; I want to find out which point of x it crosses y = 0 by linear interpolating. But by showing when the ...

ongeveer 3 jaar ago | 1 answer | 0

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how to get eigenvalues and plot it
say time is varying from 1< t < 10 I also set the element of matrix a1 = t/1, a2 = t +2 / 3 ,a3 = t/2 ,a4 = t+5 then i set u...

ongeveer 3 jaar ago | 1 answer | 0

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Question

error getting eigenvalues varying with time
xcg = 0.15; rea = 0.5; xe = 0.35; cla=2*pi ; m= 5*pi; a0 = 0; wr = (1/2); mu = 1+(3*a0^2); U = 0:0.01:1; a1 = ((mu*((U.*c...

ongeveer 3 jaar ago | 1 answer | 0

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Question

Eigenvalue and Eigenvector extracting
so I have a time array say, 0< t < 10 My elements of matrix are function that will depend on variable t. Say, a11 = (t^2)/2 ,a...

ongeveer 3 jaar ago | 1 answer | 0

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Question

How to get eigenvalues with varying coefficient
I have t varing from 0 < t < 5 and x1 = (1+t)/2, x2 = (t^2)/4 and x4 = (1+2t)/6 so i did linspace(0,5,5) A = [x1 x2; 0 x4]; ...

ongeveer 3 jaar ago | 1 answer | 0

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how to interpolate the data over uniform time grid
Since numerical solution obtained from ode45 is a non uniform in time, I need to obtain the frequency power spectrim of the solu...

ongeveer 3 jaar ago | 1 answer | 0

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Question

How to create a Frequency Spectrum plot from nonlinear equations
given three nonlinear equations dx1/dt = 3(x1+x2) dx2/dt = x1 - (1/6)x2 dx3/dt = (1/7) + (x1 -3.25)*x3 and their correspodin...

ongeveer 3 jaar ago | 1 answer | 0

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Question

How to computer a frequency spectrum and find its largest spectral energy
I am given set of equation I am suppose to plot x1 x2 and x3 as a 3d dimensional phase, but direction wants me to omit any pos...

ongeveer 3 jaar ago | 1 answer | 0

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Question

Using ODE45 for first order diff equation with three different variables
So, I am trying to use ODE45, say dx/dt = (0.1*x)+(0.25*y)-(9.8*z) I am trying to graph the behavior of x,y and z from time (0...

ongeveer 3 jaar ago | 1 answer | 0

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Question

pulling our elements from a matrix using for loop
if matrix A = [1 3 4 2 17 6 4 5 2] what is a matrix command that i can use it to pull first 6 elements?

meer dan 6 jaar ago | 1 answer | 0

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Question

comparing cells in excel then calculate for the sum
So I will try my best to explain this. So I need to find the sum of weight given chart, <</matlabcentral/answers/uploaded_f...

bijna 7 jaar ago | 1 answer | 0

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Question

while loop error with conditional statment
i %ignore this i code starts from below interval = 1.2 x_int = 0:intereval:c i=1 while x_int(i) <= c ya(i) = ((5...

bijna 7 jaar ago | 1 answer | 0

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different dimension matrix addition
for example, A = [1 2 3 4 5] B = [0 0 0 0 0 6 7 8 9 10] and i need C = [1 2 3 4 5 6 7 8 9 10] is there a way to make...

bijna 7 jaar ago | 1 answer | 0

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Conversion to logical from sym is not possible.
This is what I have syms x; ...

bijna 7 jaar ago | 1 answer | 0

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stuck on graph format! please help
so this is what I have.. <</matlabcentral/answers/uploaded_files/103530/Capture1.PNG>> but i need to make my graph look li...

bijna 7 jaar ago | 1 answer | 0

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graph comes out all rotated
so this is what i have posdegreeline = refline(tand(-45),0); negdegreeline = refline(tand(45),0); posdefreeline.Color...

bijna 7 jaar ago | 0 answers | 0

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unheard of ptitle command.. what is this???
so i am pulling out data from excel files as my input and export all my calculated data from matlab to excel output. So far ever...

bijna 7 jaar ago | 2 answers | 0

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index exceeds matrix demension
figure(1) hold on; plot(1.25,1.25,'ro'); i=1; while i <= 20 plot([xi(i),xj(i)],[yi(i),yj(i)],'b'); ...

bijna 7 jaar ago | 1 answer | 0

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how to shift origin or graph without changing the data value.
Let's say you have a (x,y) = (1,1) however is there a possible way to show another quadrant of the graph? Every time i try to se...

bijna 7 jaar ago | 1 answer | 0

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Question

Distance formula using while loop
so i given a data file, I was able to call in these values into Matlab input <</matlabcentral/answers/uploaded_files/103383/S...

bijna 7 jaar ago | 2 answers | 0

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Question

How to rescale x- axis?
so when i plot my function, i get a wide graph. <</matlabcentral/answers/uploaded_files/101612/Screen%20Shot%202018-01-17%20a...

bijna 7 jaar ago | 1 answer | 0

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Question

Data must be a single matrix Y or a list of pairs X,Y. Need help on plotting 3D graph!
array= Tmax/n; %This expends the data points n = 2000 and Tmax = 20 t = 0:array:Tmax; ...

bijna 7 jaar ago | 1 answer | 0

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Question

corrected trapezoid rule function code
I need help on matlab coding!! so assignment given is to use trapezoid rule, midpoint rule and corrected trapezoid rule to pl...

bijna 7 jaar ago | 0 answers | 0

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