Need Help Starting Code

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Bailey Smith
Bailey Smith 2018-6-23
So I'm having some trouble planning out how to tackle this problem:
A toy rocket is powered by pressurized water that is discharged from the nozzle at the beginning of the flight.
a. Plot the elevation as a function of time
b. Compute and plot the velocity and acceleration of the rocket as functions of time
c. Write a MATLAB code that will automatically determine the thruster time, the maximum altitude, the maximum velocity, and the maximum acceleration
d. The tip of the rocket transports a 2.7 gram ping-pong ball. Determine the maximum support force for the ball.
I am given data: time (in seconds) and elevation (in meters). My first problem lies in the fact that I have a TON of data. 61 pages worth of data. 2 columns and 3280 rows of data. I know I'll need to preallocate this somehow to make it run efficiently. What help/tips do you have to help me get started and to help me make it run most efficiently?
EDIT: I have m=zeros(3280,2) as my preallocation. I am considering putting the data into a file and trying to pull it, to save space.
UPDATE 1:
rTimeData=fopen('rocket_time_data.txt','r');
formatSpec = '%f';
A = fscanf(rTimeData,formatSpec);
fclose(rTimeData);
rElevData=fopen('rocket_elev_data.txt','r');
formatSpec = '%f';
B=fscanf(rElevData,formatSpec);
fclose(rElevData);
%PART B
vel=sqrt(0^2+2*(9.81)*(B-0));
acc=vel/B;
My acceleration seems to not be right. Should it be a 3280x3280? (Part A plots fine, by the way.)
  5 个评论
dpb
dpb 2018-6-24
What's the units of the elevation data?
If you have distance and time, what's definition of velocity?
Image Analyst
Image Analyst 2018-6-24
2 columns and 3280 rows of data is a microscopic amount of data, NOT "a TON of data". For example, it's like only one two-thousandths (0.05%) the amount of data in an ordinary digital image. It will easily all fit into your computer memory simultaneously.
For what it's worth, I'm attaching my demo of a projectile/trajectory. It computes just about anything one would ever want to know about a projectile.

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