# John Chilleri

### NMT

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**Feeds**

How to programmatically select which array dimension to address

Hello, I wouldn't suggest this to be an elegant solution, but it has worked so far for a number of test cases. % A is...

3 years ago | 0

How do you find the maximum number of row vectors with loop?

Hello, You can find the maximum number in a vector with a loop by keeping the largest value stored as you progress over all t...

7 years ago | 1

| accepted

Why am I not getting different values for the absolute value percent error?

Hello, I'll begin by explaining why you're getting the same value for both. First, you are creating vectors |y| and |y2| b...

7 years ago | 2

| accepted

Write a function fml(x) where given vector x returns first, middle and last. If the number of elements in the vector are even, middle should take the mean value of the innermost elements.

Hello, Let's take a look at your code, function [first, middle, last] = fml(x) %FML Returns the first, middle, ...

7 years ago | 1

| accepted

identity matrix what am i doing wrong

Hello, I would recommend you watch a video or read an introduction to coding in MATLAB. They don't take too long and should g...

7 years ago | 1

Is there a better way to perform a moving window of operations without using a for loop?

Hello, You can figure out a way to use vector notation, x = 1:100; y = sqrt(x(1:end-3).^2+x(4:end).^2); I ran thi...

7 years ago | 1

| accepted

Finding Characters place in a string by number of characters

Hello, You should be able to modify only columns 16 to 25 of that specific line with the following, fd = fopen('yourfile...

7 years ago | 0

Question

MATLAB ode113 Not Evaluating Events Function?

Hello, I've worked with ode events in MATLAB many times now; however, I can't seem to figure out why the following events fun...

7 years ago | 1 answer | 0

### 1

answerQuestion

Interp3 Producing Unexpected Output?

Hello, When using the default trilinear interpolation of interp3, I'm getting an unexpected output: >> Interpval = inter...

7 years ago | 1 answer | 0

### 1

answerOdd (\\\r\n) output from symbolic multiplication

Hello, If it's just a one-timer, you can identify where it is and remove it by: expr = [expr(1:before) expr(after:end)];...

7 years ago | 1

created a function that inputs coordinate points like (1,2) in a loop for n number of points and keeps the x and y in seperate arrays. problem is it is only taking the first numbers entered... any clues?

Hello, Your code will work with one simple change: function[x,y] = readCoordinates(n) x = zeros(n,1); y ...

7 years ago | 0

Submitted

imagesc3

Imagesc3 is a simple implementation of imagesc for 3D matrices.

7 years ago | 2 downloads |

Creation of vectors in for loop and save those and fill vector up with new column vectors

Hello, This can indeed be done: V = []; for ... A = [...]; B = [...]; V = [V A B]; end Hope t...

7 years ago | 0

| accepted

Need help plotting a set of differential equations.

Hello, You can use the built-in |ode45| function to solve this: clear all close all clc % % Initialize time ...

7 years ago | 1

| accepted

How to Stop an M File?

Hello, You can use |return| in your script and function to exit. For example, function output = blah(input) if...

7 years ago | 1

| accepted

Finding a significant difference between two datasets

Hello, Given data vectors |a| and |b| of equal length, you can use the following (assuming your x values are the default 1,2,...

7 years ago | 0

| accepted

How can I extract the white pixels of an image?

Hello, Assuming your image is of size m |x| n |x| 3, where the stored values range up to 255, you could use the following sim...

7 years ago | 0

How to sort a matrix in matlab

Hello, The |sort| function can do this for you, % Given your A - first column: A = [50 0 10 0 0 0 0 30 0 0 1...

7 years ago | 0

Script writing: using the "for loop" in matrices?

Hello, You can use a |for| loop to fill in the elements of a matrix. In your case, you are dealing with a 1 x 100 matrix, whi...

7 years ago | 0

How to count the given data range and calculate cumulative sum of given data and plot it?

Hello, If I understand your question correctly, then this might help: data = xlsread('data.xls'); sf = (0:.5:2.5)'; ...

7 years ago | 0

| accepted

Error when using the function ODE45

Hello, You just need to change a few things: *Script* - missing an @ symbol. x_interval=[0.5 10]; t0 = 0; [x,t] = o...

7 years ago | 0

| accepted

How do I present my solutions?

Hello, You could write a simple function, function printToAidanSheksDesires(A) fprintf('\nA = \n\n') fpr...

7 years ago | 1

Concatenate structure with subfields

Hello, Hopefully I understand your question properly. You can concatenate them with: data = [datarun1; datarun2; ......

7 years ago | 0

How to delete a row of a matrix if value in a particular column is less than a specified value?

Hello, You can use this one liner, datanew = data(data(:,1)>=4,:); However, I chose to reverse the logic here, so ins...

7 years ago | 0

| accepted

how can i plot this function p(Q,O)= sqr((sin(2*pi*sinQ*sinO)/(sin((pi/2)*sinQ*sinO))

Hello, To answer your original question, you can plot your function using a newer command called |fsurf|, fsurf(@(Q,O) s...

7 years ago | 0

Find the sum of the first n

Hello, This can be done simply with, n = 100; % whatever you want sum_harm = 0; for i = 1:n sum_harm = sum_h...

7 years ago | 3

Running a simulation with different parameters on each loop

Hello, Kaushik Lakshminarasimhan was correct, |for| |loops| will check all options: for nPV = 1:10 for nW = 1:2 ...

7 years ago | 1

| accepted

please explain the working of 2nd ,3rd and 4th statements of this coding portion:

Hello, This code checks to see if the diagonal elements of a given matrix A (assuming n x n) are larger in magnitude than th...

7 years ago | 2

| accepted

How can I end a for loop with an if or while loop

Hello, Yes you can end a for loop early using |break|, for N = 1:n % Do something if (some condition is met)...

7 years ago | 0

| accepted

How to draw an animated line using my data?

Hello, In this scenario, I'd recommend just plotting the line every step as the line develops. You can do this by recordin...

7 years ago | 1

| accepted