repetitively running the code and selectively plotting

I am a new learner of Matlab and I am trying to learn to code with the loops. I am stucking with a problem.

I have table "a" which has multiple rows and 2 columns of table in matlab. I attached the file here.

1st column is time and 2nd column is data (q).

I want to make a loop for 6000 rows each and generate plot (data vs time). Before generating plots I want the user to see the starting time of each loop (the time from row 1,6001,12001) and let the user to decide the specific time to generate the specific plot related to that time.

I know my code is a lot of lacking and I am doing self learning. Can somebody help me out?

u = 1:1:6000 % I want to make it loop automatically from 1 to 100 but i don't know how
r = a.Time(u)
for i = 1:1:r

figure

plot
plot(a.t(i),a.q(i))
title(sprintf('Selling vs time from %s', ),r)
xlabel('time')
ylabel('selling $')

end

[uzzi]

@dpb can you help me with this, please?

Answer 1

[Image Analyst]

First use readmatrix or readtable to read in the data and plot the whole thing with a single call to plot. Then use input to ask the user what part they want to plot. Then in your loop you need to plot one marker and then call hold on

plot(a.t(i), a.q(i), 'b.', 'MarkerSize', 8);
hold on;

[uzzi]

I am sorry. I don't understand what did you mean by marker.

[Image Analyst]

A marker is they symbol you want to plot, like a dot or a square or a triangle or whatever. If you're going to use a loop to plot, then you can only plot a single symbol at a time, OR you can plot the whole array (as much as you have up until that point). But if you do the latter, don't use hold on since in that case, we DO want the next plot to blow away the prior one.

plot(a.t(1:i), a.q(1:i), 'b-.', 'LineWidth', 2, 'MarkerSize', 8);

[uzzi]

my loop for

u = 1:1:6000 % I want to make it loop automatically from 1 to 100 but i don't know how
r = a.Time(u)

is only works for first 6000 rows. It doesn't work from 6001 to 12000 rows and furthermore. Can you hep me with this?

[Image Analyst]

How are you defnining a?

[uzzi]

"a" is a variable for the given table.