Doubt in a program

can someone explain line 13,14?

If I remove that I am getting a blank plot

Answer 1

[Torsten]

Why ?

In order to plot a time-location curve after the while-loop, the intermediate results for time and location are saved in two separate vectors.

[Vigneshwaran]

So the vector gets updated each time or the values get appended each time? I mean what will be the dimension of that vector after each iteration and also by the time loop terminates?

[Torsten]

So the vector gets updated each time or the values get appended each time?

The new values for t and y get appended each time to the vectors "time" and "location".

I mean what will be the dimension of that vector after each iteration and also by the time loop terminates?

The dimension of the two vectors "time" and "location" is the number of times the while loop has been executed. Thus the final dimension cannot be told right at the beginning - it depends on the time when y becomes negative.

[Vigneshwaran]

Understood,Thank you.

[Vigneshwaran]

time=0

time=[time:t]

In 1st iteration

time=[0:0.1]

In 2nd iteration

time=[[0:0.1]:0.2]

Is this the way?

[Torsten]

time = 0;
time = [0 ; 0.1]
time = [0 ; 0.1 ; 0.2];
...

[Image Analyst]

Again, it's recommended not to use the name of built-in functions, such as time, as your variable names.

Answer 2

[Image Analyst]

Don't use time as the name of your variable since it's a built-in function. Call it "theTime" or something.

Don't have line 20 - no need to plot twice.

Have lines 13 and 14 come before lines 11 and 12.

Have line 17 say

whos theTime % Display size of vector
whos location
plot(theTime, location, 'r-', 'LineWidth', 2);
grid on;

Post your code as code/text (not an image) if you need any more help after you read this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

[Vigneshwaran]

OK, Thanks for the info will follow from next time.

[Image Analyst]

My advice can be followed this time, on this program. No need to wait until next time (next program).