How can I plot sin(x),sin​(2x),...,s​in(nx) for an input n all on the same graph? Matrix dimensions must agree error

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Colm Murphy
Colm Murphy 2019-10-23
回答： Navadeep Ganesh U 2019-11-30
I'm trying to plot sin(x) and sin(2x) and 3x and so on up to sin(nx) all on the same graph. My code right now is as follows.
x=[-2*pi:pi/64:2*pi];
i = input('Enter a positive whole number: \n');
z=[1:i];
y=sin(x.*z);
for z = [1:i]
plot(x,y);
end
It's giving me an error saying:
Matrix dimensions must agree.
Error in lab5_exercise2 (line 9)
y=sin(x.*z);

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采纳的回答

Image Analyst
Image Analyst 2019-10-23
Put the y= statement inside the loop:
x = -2*pi : pi/64 : 2*pi;
n = input('Enter a positive whole number: ');
for z = 1 : n
y = sin(x.*z);
plot(x,y, '.-');
hold on;
end
grid on;
xlabel('x', 'FontSize', 15);
ylabel('Y', 'FontSize', 15);

更多回答（2 个）

James Tursa
James Tursa 2019-10-24
Modifying your original code without a loop:
x=[-2*pi:pi/64:2*pi];
i = input('Enter a positive whole number: \n');
z=[1:i]'; % make this a column vector
y=sin(x.*z); % use implicit expansion
plot(x,y); % no need for a loop
grid on
Navadeep Ganesh U
Navadeep Ganesh U 2019-11-30
use "hold on" for keeping plots.

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