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Plotting 3 graphs in the same figure

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Write a programme to plot the function f(x)=xsin(pi(9x+1)) over the interval [−1, 1] using increments in x of (a) 0.2, (b) 0.1, and (c) 0.01. The programme should plot the three graphs in the same figure. Include the legend to specify which graph corresponds to which increment. (Observe that the plots for cases (a) and (b) givetotally the wrong picture of ݂f(x)).
Could someone help me?
x = linspace(0.2:0.1:0.01);
y = x*sin(pi*(9*x+1));
y=[-1:1]
figure
plot(x,y)

  3 Comments

darova
darova on 26 Feb 2020
Can you show your attempts? Where are problems?
darova
darova on 26 Feb 2020
Yes. I found some mistakes
Image Analyst
Image Analyst on 9 Mar 2020
Anastasia: Did David's solution below work for you? If so, please Accept it.

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Accepted Answer

David Hill
David Hill on 26 Feb 2020
z=@(x)x.*sin(pi*(9*x+1));
x={-1:.2:1,-1:.1:1,-1:.01:1};
y=cellfun(@(k)z(k),x,'UniformOutput',false);
plot(x{1},y{1},x{2},y{2},x{3},y{3});

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