How to make a grid periodic

Question

sawasawa 2021-4-7

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/795672-how-to-make-a-grid-periodic

回答： DGM 2021-4-8

I have the code below to plot grid lines for the y values

clear all; close all; clc;
y =[-0.906   -0.120    0.664    1.450    2.235    3.021    3.806    4.591    5.377];
for i=1:length(y)
    plot(0:1:10, y(i)+(0:1:10).*0,'m');
    hold on
end

I want to make it repeat at least twice above and below with a period 2*pi . Any help on how to achieve this will be greatly appreciated.

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Answer 1

DGM 2021-4-8

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https://ww2.mathworks.cn/matlabcentral/answers/795672-how-to-make-a-grid-periodic#answer_669832

在 MATLAB Online 中打开

Do you actually need plot lines, or are you trying to make the plot gridlines have a particular spacing?

If the latter, consider the example:

y=linspace(0,6*pi,100);
x=sin(y);
plot(x,y); grid on
yl=get(gca,'ylim');
set(gca,'ytick',(yl(1):pi/4:yl(2))-0.906)

Of course, that -0.906 offset obfuscates that the spacing is a nice pi/4

On the other hand, if you really just want a bunch of lines plotted, you can do that too.

clf
% pick how far you want the lines to extend in x and y
x=[1 10];
yl=[-2*pi 2*pi]; 
% calculate the array
y=repmat((yl(1):pi/4:yl(2))'-0.906,[1 2]);
plot(x,y,'b')