Matlab Definition and 1000 Threads

Good Day Everybody, Please assist me on these problems 1. I wish to put six plots on the same plot using matlab. The details of each plot are stated below PLOT 1 x axis range 0:1 y axis range 0:1 PLOT 2 x axis range 0:1 y axis range 0:1 PLOT 3 x axis range 0:1 y axis range...

I have come across a MATLAB code for solving the spruce budworm differential equation.But,I would like to solve the same differential equation for a range of parameters(r=0:5,q=0:10).I am having problems trying to define the array of matrices for each loop.Please look at the code below:% This...

Has anyone found that their MATLAB programs are now giving nonsensical results in te latest version of matlab? I wrote a program which worked very well in the 2011 version of MATLAB but now in the 2012 version of MATLAB it still sort of runs but nor yields nonsensical results. I can show...

Hi Controlling the LEGO NXT Using MatLab What are my mistakes in this code ??! COM_CloseNXT all clc clear handle = COM_OpenNXT(); COM_SetDefaultNXT(handle); COM_CloseNXT(handle); NXT_GetBatteryLevel(handle); COM_CloseNXT(handle); COM_CloseNXT all clc clear...

Hello Everybody, I'm trying to plot the frequency spectrum of RIN using Matlab. I've the following code function p=rateblock tau_s = 3e-9; N0 = 1e24; A =1e-12; P0 = 1/(A*tau_s); TSPAN = 0:1e-2:10.23;; Y0 =[0 0]; [T,Y] = ODE45(@rate_equation,TSPAN,Y0); subplot(2,1,1)...

Hey guys. I need to graph a piecewise function in MATLAB and I don't know how to do it. On top of that, it is also in radians: f(θ) = (80/∏2) θ, -∏/2 ≤ θ ≤ ∏/2 (80/∏) - (80/∏2) θ, ∏/2 ≤ θ ≤ 3∏/2 How do I graph it in MATLAB? And other than that, is there a way in MATLAB that I can take...

Homework Statement I'm reading through the help files and came across this example: s = tf('s'); H = s/(s^2 + 2*s +10); I understand that when using a rational expression it must be specified, s= tf('s'); I also understand that the rational expression is entered through H=s/(s^2 +...

accumarray documentation Is anyone proficient in the use of accumarray? I supply two vectors of same length, indices L,weights W, L positive integers as required. I sort the indices to ascending.Then, the result of accumarray is not equal to unique(L).How could this be? Code for illustration: i...

Homework Statement The problem picture is attached(file 1),its a beam subjected to horizonatal ditributed load 2. Relevant examples the MATLAB solution for rectangular shape with vertical load on the upper right corner is like follow, i try to modify it according to the new picture...

Homework Statement A straight wire of electric charge truncate to length L has a linear charge density of ρ= 8 C/m. Using a computational approach calculate the electric field due to the truncated line at any arbitrary point in space. Consider L = 1 m, assume line lies along y-axis with...

I programmed a function that outputted this weird answer that looks like: ans = 1.0e+147 * Columns 1 through 16 0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 Columns...

Homework Statement Okay, so I need some help with this Matlab program. I never learned Matlab, so I'm trying to do it as best as I can. The question is: Calculate the 2nd and 3rd degree Taylor polynomials for the function f(x)=ln(1+x) about the point a=0 Plot these polynomials and the...

Hi friends. I want to fit my x datas and y datas with a function in the most exact way.my data is: x=[0.3 0.5 0.7 0.9 1 1.3 1.4 1.5 2 3 5 7 9 10 30 50 70 90 100]; y=[13.4347 8.3372 6.3107 5.27 4.93 4.28 4.14 4.0199 3.6349 3.3178 3.1282 3.0691 3.0432 3.0354 3.0043 3.0016 3.0008 3.0005...

Hi all, I am having database of 963 users . Records of two users are uid gender occupation age 1 F student 23 2 M teacher 30 Now i need to calculate the similarity of each user with every other as sim(ui,uj)=0.8*sim(age) +...

Hey guys. I am trying to simulate some circuits in MATLAB's Simulink, and I always get some weird graph which is not sinusoidal at all. I wanted to know if anyone could tell me which block am I missing if I want to get a good sinusoidal wave. Here are the pictures of the circuit and the...

Hi friends I want to get 3variable integral from a function which is in terms of x,y,z,m,a but I know that a=0.01 and m=3 and want to integrate over x ,y,z >> triplequad((4 .*((-2.* a + m).^2 .*(4 .*a + m) +4 .*a.^2 .*(2.*(2.*a - m).* cos(z) + cos(y) .*(4.* a - 2.* m + 4 .*a.* cos(z) - m...

I need to make two plots of volume as a function of time vs pressure as a function of time. When plotted the graph will have an enclosed area. I am having trouble on how to have MATLAB plot these two functions against each other. My experience with MATLAB is having a function defined in a...

I'm having trouble getting two outputs. Here's a simple example: function [a b] = test2() a = 2; b = 5; When I run the code, I only get the output of a = 2: >>test2 ans = 2 How can I get b outted as well?

Hi all, I would like to be able to plot this function in MATLAB \mathcal{V} (\phi_{1}, \phi_{2}) = m^2(\phi_{1}^2 + \phi_{2}^2) + \lambda( \phi_{1}^2 + \phi_{2}^2)^2Where \phi_{1,2} , m^2 , \lambda \in \mathbb{R} and \lambda > 0 I am aware that the cases m^2 > 0 and m^2 < 0 yield two...

This is what my book gives for recursion of fibonacci sequence (matlab coding). function res = fib(n) if n == 1; res = 0; elseif n == 2 res = 1; else res = fib(n-1) + fib(n-2); end Am I mistaken or this doesn't work for fib(3)? Keep in mind I am still learning about...

A is a sparse matrix. B is a vector. I have the following code: for j=1:N B=A*B; end; This part of the code is inside a function which gets called about 160000 times. I ran the Profiler and this part is the bottleneck. How can I make it more efficient?

Hello, This is my first semester as a graduate student in astrophysics. I have a project and I should use MATLAB. Unfortunately, I don’t know how to use the software. Can someone please recommend any tutorials, books, links, ebooks, … Thanks a lot

I made a user-defined function for Height. function Ht=Height(t,V,Theta); Ht=V*t*sin(Theta)-4.9*t.^2; end V is initial velocity, and i kept on getting input "V" is undefined. Can someone help me please!

I tried to make a user-defined function. function Ht=Height(t,V,Theta); Ht=V*t*sin(Theta)-4.9*t.^2; but then i kept on getting Input argument "V" is undefined... can someone help me please

My book explains the command x(:,1) as "x,all rows,first column". Q.How does the output of ode45 for a system of differential equations look like? But,when I solve a system of 2 first order differential equations(w.r.t time),I take x as a "column vector". [x1 x2] So,if I wanted to plot x(1)...

dear friends i want to do set of operation in MATLAB but i have a problem: first of all, i want to take 3variable integration from f which is function of x,y,z,m,a but i want to integrate only over x,y,z after that for a special "a" forexample a=0.01 i want to solve the equation.i mean...

I am trying to investigate the statistical variance of the eigenvalues of sample covariance matrices using Matlab. To clarify, each sample covariance matrix, \hat{\mathbb{R}}_{nn}, is constructed from a finite number, N, of vector snapshots, each sized (L_{vec} \times 1) (afflicted with random...

How does Matlab or computer algebra systems find derivatives of functions? Is it correct that they use matrix transformation?

Hello I am trying to calculate the n-point DFT of a signal using fft where n=512 and plot it in matlab. The signal is a separate file that I have read into matlab. I am able read and plot the first 512 values of the signal but when I try to get the dft of the signal and plot it the outcome does...

Okay so what does this line of code mean: snleg = strtrim(cellstr(num2str(alf_deg.'))); I did some research and it is ultimately removing whitespace (comma's, spaces etc) from a file scanned in, but I don't understand the argument of the function. I don't understand what cellstr is or...

error in defined expression for Fresnel equation in MATLAB (urgent please )?? hi i have code for plotting Fresnel equation but there's something i didn't understand it and gives error >>((( plotopt - plotting option (type 'R' for plotting reflectivity, % 'A' for absorptivity or 'RA'...

How can I do the summation of x^2 from 0 to 3 without the use of any built-in functions? I know a for loop is involved, but I can't get it to work.

I've been using this for a Newton Approximation in Matlab function x = Newton(f, fp, x, nmax, e) % f is an inline function which we apply Newton's method on % fp is an inline function that is the derivative of function f % x is the initial guess of the root % nmax is the total number...

Here is the code I have, but I keep getting the error message: Undefined function 'f' for input arguments of type 'double'. I don't know what I have that is causing this. Does anybody see what's wrong with my code? MaxIt = 1000; epsilon = 10^-5; a=1; b=2; c = (b+a)/2; NumIt = 0...

i have 2 simple MATLAB questions first when i have two matrices the first one is empty and the second one conatins numbers i can Say A=B SO THE VALUE OF B BECOMES INSIDE A BUT MY QUESTION I JUST DEFINE SYMS EI and multiply it by B bUT When itry to put Put B in A IT DOENST WORK COULD...

Hi all, (Don't mean to spam, meant to put this in General Math not General Engineering!) I'm running the following code in MATLAB: function M = nonNewtonian(~) M = bvpinit(linspace(0,10,301),@VKinit); sol = bvp4c(@VK,@VKbc,M); figure; hold all; plot(sol.x,sol.y(2,:))...

How do I plot something like (x-4)(x-5)(x-6)? I've tried: x = -6:0.01:6; y = (x-4)*(x-5)*(x-6); plot(x,y) It's giving me the error: Error using * Inner matrix dimensions must agree.

Hello everybody! I'm quite new with Matlab and I'm starting trying some stuff.. well I was trying to input det(a) where a=[1,2,3;4,5,6;7,8,9] and this should be zero. And I mean 0.0000 but the result is 6.6613e-16 why?O.o

Hi everyone, Lets say i have created a column vector c = [ N x 1 ] and my time vector has the same dimensions. I want to create a function f(t) in which f(fstep) = c(cstep) where cstep is integer and fstep maybe not. ( for example f(0)=c(0), f(0.1)=c(1), ... f(10)=c(100)) As a result i...

Hi, I am trying to plot the AN product sec II.C in the attached paper as: clear all clc s=0.5; w=0; d=5; f=0:20; NdB1=(17-30.*log10(f)); N1=10.^(NdB1./10); NdB2=40+20*(s-0.5)+26.*log10(f)-60.*log10(f+0.03); N2=10.^(NdB2./10); NdB3=50+7.5*w^0.5+20.*log10(f)-40.*log10(f+0.4)...

Hi, I'm thinking about getting this laptop, it's small and cheap. I hope it's good enough for doing student-level calculations in Matlab, perhaps some simple programming, surfing, writing documents in Word etc. Anyone tried Matlab on one of these? I currently have a laptop but I'm so used to...

Given the following system of equations 3x1 + ax2 = 1 ax1 + 4x2 = 0 where -pi ≤ a ≤ pi. We would like to find out the range of values of x1 and x2 that are observed as a is varied. Do this as follows: 1. Create a for loop that uses the variable a as the indexing value, varied from over...

Is there one? Or do I really have to write something like this: from numpy import * with open('file.txt','r') as f: #read only data, ignore headers lines = f.readlines()[31:] # convert strings to floats and put into arrays for i in xrange(len(lines)): s =...

Homework Statement Hey Everyone! So I have an assignment that says to approximate the integral f(x)=e^(3x), -1<x<3. Answer the following questions Run the code with N=10, N=100, and N=1000. For each approximation, when does the result agree with the exact value of the integral to 4 digits? How...

Good day. Could anyone tell me how to simulate an equivalent Operational Amplifier in Simulink? I read somewhere that I had to do it with 2 adders and a gain block, but I don't know how. Thanks.

THE PROBLEM : y(t) = e^(-t)*sin(t^2); with t0 = 0 and T = 3.14159. Find y_0, and use it to deduce the corresponding expression for f(t, y) (Your f should have both a t and a y in it. Simplify it to find the y!). This is for a MATLAB project. I've solved this differential equation (which we...

Homework Statement I need to answer the attached question, but we haven't done anything similar in class and the book isn't proving to be helpful for me. I'm not sure if I have to use matlab, we were given this code but I can't even understand what it is calculating. % f(x), the function...

The Problem: Write a function that finds the factorial of a positive integer without using for or while loops, the factorial function, or the : range operator. Honestly, I don't really know how to start with this one. If I were able to use a for loop it would be easy, and I don't see how I...

A3.m: %x = 0:pi/100:2*pi; %y = sin(2*x); %z = 2*cos(2*x); %plot(x,y,'k',x,z,'--b') %title('Plot of f(x)=sin(x) and it''s derivative') %xlabel('X-axis') %ylabel('Y-axis') %legend('sin(2x)','2cos(2x)') x = -2:0.01:2 y = f2(x) plot(x,y) f2.m: function F = f2(x) F(1) =...

Hello. I am new in matlab. And I wonder how to solve equations using gauss-seidel iteration method. Theoreticaly I understand how this method is working, but can't get how write script in matlab. It can be great if somebody can give a explanation for this problem.