# S. Walter

### Reaction Systems, Inc.

Aerospace engineer focused on propulsion research and development. Background in fluid dynamics, inlet design, turbomachinery.

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How I can extract certain range of value from workspace?

You have a matrix A: A = rand(100,100); You want only the 5th through the 10th elements, you can do that using the colon opera...

11 months ago | 0

Else if statement imbedded in a for loop

If you want your for loop to pick only one item from the Tp vector, you have to iterate Tp inside your for loop. Thus: if Tp<=...

11 months ago | 0

How to save each image generated in a for loop?

You can print the image: print('filename','-dpng','-r300') where '-dpng' can be set to whatever format you want (check out the...

11 months ago | 0

Last else if graph not plotting

I tried the following: % Clear the command window and close the figures clc close all % Make a color vector for plots col...

11 months ago | 1

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Convert given decimal number to binary number.

Convert given decimal number to binary number. Example x=10, then answer must be 1010.

11 months ago

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Find the longest sequence of 1's in a binary sequence.

Given a string such as s = '011110010000000100010111' find the length of the longest string of consecutive 1's. In this examp...

11 months ago

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Cell joiner

You are given a cell array of strings and a string delimiter. You need to produce one string which is composed of each string fr...

12 months ago

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Perimeter of a semicircle

Given the diameter d, find the perimeter of a semicircle

12 months ago

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Approximation of Pi (vector inputs)

Pi (divided by 4) can be approximated by the following infinite series: pi/4 = 1 - 1/3 + 1/5 - 1/7 + ... For a given numbe...

12 months ago

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Approximation of Pi

Pi (divided by 4) can be approximated by the following infinite series: pi/4 = 1 - 1/3 + 1/5 - 1/7 + ... For a given numbe...

12 months ago

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Pi Estimate 1

Estimate Pi as described in the following link: <http://www.people.virginia.edu/~teh1m/cody/Pi_estimation1.pdf>

12 months ago

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Calculate area of sector

A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area. Area of sector A is defined as 0.5*(r^2...

12 months ago

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radius of a spherical planet

You just measured its surface area, that is the input.

12 months ago

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Who has power to do everything in this world?

There is only one person who is older than this universe. He is Indian version of Chuck Norris.

12 months ago

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Who Has the Most Change?

You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

12 months 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 ...

12 months ago

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Remove the vowels

Remove all the vowels in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill' Output s2 is 'Jck nd Jll wn...

12 months ago

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Summing digits

Given n, find the sum of the digits that make up 2^n. Example: Input n = 7 Output b = 11 since 2^7 = 128, and 1 + ...

12 months ago

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Is the input divisible by 3?

Return true if the input is divisible by 3 and false if not.

12 months ago

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Back to basics 15 - classes

Covering some basic topics I haven't seen elsewhere on Cody. Return the class of the input variable.

12 months ago

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Simple equation: Annual salary

Given an hourly wage, compute an annual salary by multiplying the wage times 40 and times 50, because salary = wage x 40 hours/w...

12 months ago

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Remove any row in which a NaN appears

Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

12 months ago

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How to calculate the length of a triangle's side given two angles and one side

You are given a triangle with angles alpha, beta and gamma and sides a opposite alpha, b opposite beta and c opposite gamma. ...

12 months ago

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Weighted average

Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

12 months ago