How to start a plot on the same axis at a different value?

Question

Seba.V 2019-10-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/487731-how-to-start-a-plot-on-the-same-axis-at-a-different-value

回答： David Hill 2019-10-28

Hi guys,

I am trying to plot two different linear equations functions and the sum of the two together. However, I would like to have one of the lines to start from zero when x=2 instead of when x=0. The resultant linear plot of the sum of the two functions that I am seeking should be equal to the function (y) until function (y1) starts at 2 and it would then decrease and become negative (since y1 decreases at a higher rate).

I hope it is clear enough my expalnation of what I am trying to do.

This is the code I have used.

x=0:1:24;
y=2*x;
y1=-4*(x-2);
r=y+y1;
plot(x,y,x,y1,x,r)
grid on
legend('y','y1','r')

Thank you in advance

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Answer 1

David Hill 2019-10-28

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/487731-how-to-start-a-plot-on-the-same-axis-at-a-different-value#answer_398455

在 MATLAB Online 中打开

x=0:1:24;
y=2*x;
y1=-4*(x-2);
y1(1:2)=0;%y1=0 when x<2 (if you change the x vector you will need to change this
r=y+y1;
plot(x,y,x,y1,x,r)
grid on
legend('y','y1','r')