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PhD (Scholar) Mathematics

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How can I solve this?
% Solve the system of equations starting at the point [0,0,0]. % PL = x(1); c = x(2); k = x(3); % Initial guess is [0,0,0], yo...

Question

Problem in implementing Echelon Form and Solve System of Linear Equations
Here is my code: A = [3 2 1;-4 5 7;1 0 -9]; b = [1;4;5]; % Solving System of Linear Equations by using built-in command for i...

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How to do manual operation of cross multiplication or substitution?
If syms A B x y = A*x^2 + B*x; dy = diff(y) d2y = diff(dy) then how to get where d2y is the second derivation; using subs o...

ungefär ett år ago | 1 answer | 0

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Optimize legend command?
Hi, I am struggling with LaTeX in legend, so far I wrote legend like: legendStrings = string(n); l = legend(legendStrings); s...

ungefär ett år ago | 1 answer | 0

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What's the problem with this simple anonymous function?
Here's an simple code: clear all; clc; close all; n = 1:3; for i = 1:numel(n) %numel is used if someother time I'll use negat...

ungefär ett år ago | 1 answer | 0

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How to adjust initial condition to nondimensionalization of coupled ODE?
Here is the code for dimenional and non-dimensional form of coupled ODEs using ode45, but both results are not agreeing. Please ...

mer än ett år ago | 0 answers | 0

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ODE solution using Fourier series
Hello, I am trying to solve first order ode () using Fourier Series. I wrote the code, but I was doing something, please idetif...

mer än ett år ago | 1 answer | 0

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Calling Euler Method to solve Shooting Method
Hi, I am trying to solve a BVP: y''(x) +5y'(x)+4y(x) = 1 with boundary conditions y(0) = 0 and y(1)=1 using shooting method. ...

nästan 2 år ago | 1 answer | 0

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How to correct the regenerated plot of given analytical solution of ODE?
for for The analytical solution for this ODE is given belown and written as MATLAB in code routine: for t = -log(1-a)...

nästan 2 år ago | 0 answers | 0

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Question

Addition of numbers in array as string
I am following these lines of code, but generating error when I do: x = randi([0,9],1,20); y = randi([0,9],1,20); x_new = st...

nästan 2 år ago | 1 answer | 0

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Question

Lets' say I have 2 vectors: x = [7 4 6]; y = [1 4 4]; But these are not just vector consider them as A number, i.e., 746 and ...

nästan 2 år ago | 1 answer | 0

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Plot with smaller variation in input argument under user defined function?
I am stuck with a smaller concept that How to Plot with smaller variation in input argument under user defined function? For ex...

ungefär 2 år ago | 1 answer | 0

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How to save last three values from for loop?
I just got stuck to save the last three values of r from the for loop, please help me in this regard. yl = 1; rl = [0, yl] ; ...

ungefär 2 år ago | 1 answer | 0

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How to combine the result of for loop?
Here is a very simple line of code: x = 3; A = 1:x; for i = 1:length(A) y = repelem(A(:,i),i); Y = y(1,:) end I w...

mer än 2 år ago | 1 answer | 0

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Question

Sum and Difference across row and column
Let say there is square matrix of order n-by-n, and n is odd integer A = rand(3) A = 0.4218 0.9595 0.8491 0...

nästan 3 år ago | 2 answers | 0

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Trouble using fsolve with two non-linear equations and 3 parameter
I think it will works like in this way: function F = eql_coef(x) % x(1) == a % x(2) == d K_H2O = 20.999; K_OH = 1.0478; p ...

nästan 3 år ago | 0

Is this a bug in bar plot
I suggest you to use two additional lines of code highValue=10E15; y = [2 2 3*highValue; 2 5 6*highValue; 2 8 9*highValue; 2 1...

nästan 3 år ago | 0

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merge mat files with different size?
Hi, Consider I have different .mat files and I want to merge them all and remove the repeated values, but the first problem I a...

nästan 3 år ago | 1 answer | 0

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need help to plot a mesh
I just want to mesh plot a dirac delta function, can somebody help me to do so. I wrote some lines of code to plot dirac delta ...

ungefär 3 år ago | 1 answer | 0

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Question

What is the error in this computation?
Here I want to plot a simple sum. I computed it manually by iterating different values, and then did it same by using for loop,...

ungefär 3 år ago | 1 answer | 0

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Error in computing numerical solution?
I am enable to compute numerical solution, as it generates weird Initial conditions (may be) compared to the inintial value of U...

ungefär 3 år ago | 0 answers | 0

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Question

Spectral Method without FFT in MATLAB
Can somebody guide me that how spectral method will be implemented in MATLAB to PDE (lets say homogeneous heat equation with per...

ungefär 3 år ago | 0 answers | 0

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Specrtal Method for Heat Equation
I have one dimensional homogeneous heat eqaution. I want to solve it numerically using by supposing where Taking time deri...

ungefär 3 år ago | 0 answers | 0

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How do i use boundary conditions to find variables in an equation
if you let Lp=constant and make changes in soln = solve(u,eqns,vars); to soln = solve(eqns); you will get a structure soln ...

ungefär 3 år ago | 0

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setting column of a matrix to zero
You haven't define constants a and z, and a vector mt, so I suppose a=-1, z=4 and mt=rand(1,50) and following lines of code to p...

ungefär 3 år ago | 0

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How to plot analytical solution in terms of Fourier Series
I want to plot the analytical solution of the equation given below: for x=-1:1 and t=0:0.4:2 for as suitable values of p. I...

mer än 3 år ago | 1 answer | 0

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Question

How can i plot an inline function?
I wrote a code in which i got and inline function as U = Inline function: U(p,t,x) = (372863112183097.*exp(500....

mer än 3 år ago | 2 answers | 0

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use the following after the plot command xlabel("y_{" + n + "}", 'Interpreter', 'tex') %for alphabet and xlabel(" \Omega_{"...

mer än 3 år ago | 0

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I am facing problem with big fraction
Hello everyone, When i am writing the following code, "sumx" returns me value in fraction, i want to show my result in terms of...

mer än 3 år ago | 0 answers | 0