For Matlab for Engineers, author Holly Moore, chapter 8, problem 8, I do not und

Question

For Matlab for Engineers, author Holly Moore, chapter 8, problem 8, I do not understand why my graph is not displaying two black lines I have commanded that represent the average of September and February. What code is off?

x = year;

y1 = sept_avg;

y2 = feb_avg;

figure(4)

yyaxis left

plot(x,y1)

xlabel('year')

ylabel('September')

yyaxis right

plot(x,y2)

ylabel('February')

hold on

s_avg = 18.79; % million square kilometers

f_avg = 3.04; % million square kilometers

x2 = [1979:2010];

plot(x2,s_avg,'-k',x2,f_avg,'-k')

hold off

title('Ice Extent of the Antarctic Sea')

xlabel('year')

ylabel('September')

ylabel('February')

legend('Sept','Feb','1979-2010 avg','1979-2010 avg')

Explanation / Answer

May be in your MATLAB version yyaxis right or yyaxis left commands are not working. due to this plot is not displaying.

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