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Find the numeric mean of the prime numbers in a matrix.
There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

2 years ago

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Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

2 years ago

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Remove all the consonants
Remove all the consonants in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill'; Output s2 is 'a ...

2 years ago

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Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Input...

2 years ago

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Back and Forth Rows
Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

2 years ago

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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 ...

2 years ago

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Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

2 years ago

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; ...

2 years ago

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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...

2 years ago

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Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displayed ...

2 years ago

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Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

2 years ago

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Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

2 years ago

Answered
Load files from two different folders
Use the addpath() function to add the path to your second folder to the working directory: Add folders to search path - MATLAB ...

3 years ago | 0

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Question related to pcolor bar and its position
You can manually change the position of the colorbar using the 'position' property. Here's an example: fig = figure; subplot(2...

3 years ago | 1

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Question

When copying plot from one subplot position to another using copyobj, the second plot exhibits "hold on" behavior while the first doesn't.
Here's a bare bones version of the code that illustrates the problem. I want both plots to not hold on to previous iterations. W...

3 years ago | 2 answers | 0

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How to count date occurrence independently of year?
This is a cool way of visualizing it as well: clear; dates = readtable('C:\Users\jacob\Downloads\Dates.xlsx','ReadVariableName...

6 years ago | 0

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I need help with my code. I don't understand what the error code is for. This is the error code Error: File: Lab1Modeling.m Line: 18 Column: 12 The expression to the left of the equals sign is not a valid target for an assignment.
There are a few problems with your code as written: First, you are using curly braces instead of using the while/end or if/end ...

6 years ago | 1

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How do I Average across structure
Here's a possible solution I used to solve your problem: clear; close all; % This part just creates dummy data similar t...

7 years ago | 0

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I keep getting ??? Error using ==> plus Matrix dimensions must agree. Error in ==> dewpoint at 6 f(T,RH)=((a*T)./(b+T))+log(RH/100)
Your T has 4 elements (1x4) while your RH has 8 (1x8). When you try to add them together in your function, MATLAB doesn't know ...

8 years ago | 0

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count frequency of each unique occurence in an Nx2 matrix
You could iteratively test each row for the combo you are looking for, adding 1 to the total each time a match is found, like so...

8 years ago | 1

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please help regarding plot
Doubt you'll get much use out of this, but here's how I recreated the plot in the link you gave! numbers = round(9*rand(5...

8 years ago | 0

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Recursion, stock simulation
Instead of giving each variable a name with a different number, store all of these things in one array. So instead of S_0, S_1,...

8 years ago | 0

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Read different files with different names (string) in a loop in MATLAB
You don't need to use sprintf. Try the following: C={'a.dat', 'b.dat', 'c.dat',...}; for i = 1:n fid(i) = fopen(C{i}...

8 years ago | 0

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Need help finding a point on a line.
The polyfit() function you are using gives you the slope and y-intercept of your best fit line. In this case, your p = [0.2190,...

8 years ago | 0

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Anybody know how to simplify this?
Not sure about the first one, but for the second one, the for loop and indexing is unnecessary. See this example: This... ...

8 years ago | 0

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Use ode values without storing
You could create a function that calls ode23, finds the sum of S, and then returns that sum. Something like this: function...

8 years ago | 0

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Calculating radius of circle
Using the following equation: <<http://hawaii.hawaii.edu/math/Courses/Math110/Graphics/Circle.jpg>> You have three unknown...

8 years ago | 3

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How can i convert .dat file values into days or months or years? Using Matlab?
If I'm understanding you correctly, maybe try something along these lines: milliSeconds = 221+3.5*rand(15006,1); % This ...

8 years ago | 0

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I have a matrix which is 1000 columns and 3621 rows, how do I take the mean of each row?
In general, if you have a matrix A and want to take the mean across a certain dimension, dim, you should use mean(A,dim). ...

8 years ago | 1

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how to eliminate unwanted spikes with peaks
You could try interpolating the data to get a clearer peak. Here's an example: This code generates a peak similar to the one...

8 years ago | 1