# Jacob Wood

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**Content Feed**

How to use FORTRAN program in MATLAB

You can use Matlab to execute sytem commands on your machine. If you can run the fortran program from the command line, you can ...

4 years ago | 0

Filtering through multiple vectors for a single set of values

Chad, This might be a solution for you. It picks the most common root label and grabs all of them: Q1 = [ 2, 1, 1, 0.058437210...

4 years ago | 0

how can I solve this problem?

Hi Sharon, This is a perfect application for Matlab's logical indexing. x_is_one = x == 1; %find locations where x=1 y_select...

4 years ago | 1

How to organize and analyze my excel files in matlab?

Hi Randy, readtable() might be a nice place to start. https://www.mathworks.com/help/matlab/ref/readtable.html After the data ...

4 years ago | 0

How to measure the distance error between local and global trajectories?

My approach would be: resample red curve onto the blue x values using interp1, find local error in each point, sum together to c...

4 years ago | 2

Contour plot on top of surface plot

You can get similar results with surf() and contourf() [X,Y,Z] = peaks(25); surf(X,Y,Z-10) hold on contourf(X,Y,Z)

4 years ago | 0

Column Comparison and Boolean

Matlab is pretty good at this one :) responsearray = A(:,2:2:end)>A(:,1:2:end); What we are doing here is creating an array wi...

4 years ago | 0

Removing Short Runs from Binary Data

I've got a silly one-liner: A = [0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,...

4 years ago | 0

Working with tables: populate column of NaNs in table 1, with contents of column of table 2, given a condition.

It is possible to do with a small amount of code. The easiest way to utilize a table like your "t_2", where the "letter" column ...

4 years ago | 0

| accepted

Help with event function in ode15s

The event you are looking to implement sounds quite similar to the example event Matlab uses in the documentation. We can change...

4 years ago | 0

Interpolation data to achieve gridded latitude and longitude when I have 360 month

Behzad, I believe the scatteredInterpolant() function is ideal for this case. This solution below is certainly not the fastest,...

4 years ago | 1

| accepted

How to take curl of numeric vector fields?

Matlab kindly includes a builtin curl() function, you can find information and a sample implementation here: https://mathworks.c...

4 years ago | 0

| accepted

How to extract rows from a table?

Lucas, Matlab can be very good at working with tables and indexing like this. One of the most powerful concepts in Matlab is lo...

4 years ago | 0

Cell array help with strings

One way this could be accomplished is by tracking what cell you are currently looking to write into, and then increasing this "c...

4 years ago | 1

| accepted

Import Data and plot it with an extra variable as vector

Should be an easy fix! What you are looking for is an element-wise divide: https://www.mathworks.com/help/matlab/ref/rdivide.h...

4 years ago | 0

Loops in parfor are overly slow in a very simple code

Matlab actually multithreads element-wise multiplication, thus using all available cores in the "single core" case and no additi...

4 years ago | 0

| accepted

STREAMING REAL TIME DATA FROM EXCEL TO MATLAB

One possibility - you can constantly read the Excel document with xlsread(); this will read in new values every time the Excel d...

4 years ago | 0

How can i retrieve column based on cell values?

You can accomplish this with logical indexing. See below for an example: d = {'Putih','Abu-abu','Hitam'; 0.014149,0.04175,0.081...

4 years ago | 1

| accepted

Cylinder fit to a point cloud data

Not the fastest running solution, but I think rather straightforward. This uses fminsearch() to find the 6 parameters that defin...

4 years ago | 0

Solved

Find the peak 3n+1 sequence value

A Collatz sequence is the sequence where, for a given number n, the next number in the sequence is either n/2 if the number is e...

4 years ago

Solved

Alphabetize by last name

Given a list of names in a cell array, sort the list by the last name. So if list = {'Barney Google','Snuffy Smith','Dagwood ...

4 years ago

Solved

Read a column of numbers and interpolate missing data

Given an input cell array of strings s, pick out the second column and turn it into a row vector of data. Missing data will be i...

4 years ago

Solved

An asteroid and a spacecraft

🚀 Imagine a non-relativistic simple situation. Assume positions p0, p1, p2, and p3 are three dimensional Cartesian ...

4 years ago

Solved

Acid and water

⚖ ⚖ ⚖ ⚖ ⚖ ⚖ ⚖ ⚖ Assume that there is a 100 liter tank. It is initially fi...

4 years ago

Solved

Birthday cake

It's Cody's 5th birthday, and you've been tasked with putting the candles on the cake. Your goal is to maximize the distance bet...

4 years ago

Solved

The 5th Root

Write a function to find the 5th root of a number. It sounds easy, but the typical functions are not allowed (see the test su...

5 years ago

Solved

Find the sum of all the numbers of the input vector

Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

5 years ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]

In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

5 years ago

Solved

Interpolator

You have a two vectors, a and b. They are monotonic and the same length. Given a value, va, where va is between a(1) and a(end...

5 years ago