# PetronasAMG

Engineering student who needs a lot of help with matlab!

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**Content Feed**

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...

3 months ago | 2 answers | 0

### 2

answersQuestion

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...

3 months ago | 1 answer | 0

### 1

answerQuestion

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 ...

4 months ago | 1 answer | 0

### 1

answerQuestion

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...

4 months ago | 1 answer | 0

### 1

answerQuestion

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...

4 months ago | 1 answer | 0

### 1

answerQuestion

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...

4 months ago | 1 answer | 0

### 1

answerQuestion

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]; ...

4 months ago | 1 answer | 0

### 1

answerQuestion

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...

4 months ago | 0 answers | 0

### 0

answersQuestion

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...

4 months ago | 0 answers | 0

### 0

answersQuestion

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...

4 months ago | 1 answer | 0

### 1

answerQuestion

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...

4 months ago | 1 answer | 0

### 1

answerQuestion

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?

4 years ago | 1 answer | 0

### 1

answerQuestion

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...

4 years ago | 1 answer | 0

### 1

answerQuestion

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...

4 years ago | 1 answer | 0

### 1

answerQuestion

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...

4 years ago | 1 answer | 0

### 1

answerQuestion

Conversion to logical from sym is not possible.

This is what I have syms x; ...

4 years ago | 1 answer | 0

### 1

answerQuestion

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...

4 years ago | 1 answer | 0

### 1

answerQuestion

graph comes out all rotated

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

4 years ago | 0 answers | 0

### 0

answersQuestion

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...

4 years ago | 2 answers | 0

### 2

answersQuestion

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'); ...

4 years ago | 1 answer | 0

### 1

answerQuestion

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...

4 years ago | 1 answer | 0

### 1

answerQuestion

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...

4 years ago | 2 answers | 0

### 2

answersQuestion

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...

4 years ago | 1 answer | 0

### 1

answerQuestion

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; ...

4 years ago | 1 answer | 0

### 1

answerQuestion

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...

4 years ago | 0 answers | 0