a file called avehighs.dat stores for three locations

Full question:

A file called avehighs.dat stores for three locations the average high temperatures for each month for a year (rounded to integers). There are three lines in the file; each stores the location number followed by the 12 temperatures (this format may be assumed). For example, the file might store:

432 33 37 42 45 53 72 82 79 66 55 46 41

777 29 33 41 46 52 66 77 88 68 55 48 39

567 55 62 68 72 75 79 83 89 85 80 77 65

Write a script that will read these data in and plot the temperatures for the three locations separately in one Figure Window. A for loop must be used to accomplish this.

My code so far:

avehighs=[432 33 37 42 45 53 72 82 79 66 55 46 41;777 29 33 41 46 52 66 77 88 68 55 48 39;567 55 62 68 72 75 79 83 89 85 80 77 65];

save avehighs.dat avehighs -ascii

[a,b,c]=plottemp(avehighs)

function [h,j,k]=plottemp(d)
y=d(1,2:13);
for i=1:12
    x=i;
h=plot(x,y,'bo');
xlabel('Month')
ylabel('Average High Temps')
title('Location',d(2,1))
end

y2=d(2,2:13);
for i=1:12
    x=i;
    j=plot(x,y2,'bo');
    xlabel('Month')
    ylabel('Average High Temps')
    title('Location',d(2,1))
end

y3=d(3,2:13);
for i=1:12
    x=i;
    k=plot(x,y3,'bo');
    xlabel('Month')
    ylabel('Average High Temps')
    title('Location',d(3,1))
end

end

Answer 1

[Voss]

Instead of looping over months, (for i = 1:12), you can plot all the months for a given location at once, and loop over locations (for jj = 1:size(d,1)).

Something like this:

avehighs=[432 33 37 42 45 53 72 82 79 66 55 46 41;777 29 33 41 46 52 66 77 88 68 55 48 39;567 55 62 68 72 75 79 83 89 85 80 77 65];

save avehighs.dat avehighs -ascii

h = plottemp(avehighs);

function h = plottemp(d)
hold on
x = 1:12;
h = zeros(1,size(d,1));
for jj = 1:size(d,1)
    y = d(jj,2:13);
    h(jj) = plot(x,y,'o');
end
xlabel('Month')
ylabel('Average High Temps')
legend(compose('Location %d',d(:,1)),'Location','best')
end

[Brian]

Thank you so much!

[Voss]

You're welcome! Any questions, let me know.

Answer 2

[Adam Drake]

clc, clear variables, close all

avehighs=[432 33 37 42 45 53 72 82 79 66 55 46 41;...
          777 29 33 41 46 52 66 77 88 68 55 48 39;...
          567 55 62 68 72 75 79 83 89 85 80 77 65];

save avehighs.dat avehighs -ascii

input = readmatrix('avehighs.dat');

plottemp(input)

function plottemp(data)
    month = 1:12;
    location = data(:,1);
    temp = data(:,2:13);

    plot(month,temp) 
    xlabel('Month')
    ylabel('Average High Temp')
    title('Average High Temperatures')
    legend(num2str(location),'Location','South')
end