Plotting graphs with setting my own scales

Question

Hmm! 2021-3-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/764366-plotting-graphs-with-setting-my-own-scales

评论： the cyclist 2021-3-6

I plotted these nonlinear functions

fplot (@ (x)x^2 -2) 
hold on
fplot (@(x) sqrt(x+2)) 
hold on
fplot (@(x) (x^2 + 2)/(2*x-1) ) 
hold on
fplot (@(x) (x^2 + 2)/(2*x-1) )
hold on
fplot (@(x) 1*x ) 
hold off
grid on

I donot like MATLAB's build in scaling. I want the scales to be something like 2cm to 1 unit on both axes so that the plot will look exactly like this:

Can anyone please help me out? Thanks.

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Answer 1

the cyclist 2021-3-6

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/764366-plotting-graphs-with-setting-my-own-scales#answer_640376

编辑：the cyclist 2021-3-6

在 MATLAB Online 中打开

figure

hold on

fplot (@ (x)x.^2 -2)

fplot (@(x) sqrt(x+2))

fplot (@(x) (x.^2 + 2)./(2*x-1) )

fplot (@(x) 1*x )

grid on

xlim([0 3.2])

ylim([0 3.2])

axis square

This is not quite exactly the same, but it's a lot closer. Good enough?

Note that you also had some matrix multiplication and division in your function definitions, which I assume was not intended. Take note of the changes I made.

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Hmm! 2021-3-6

编辑：Hmm! 2021-3-6

Why is there a dash-dash vertical line at

? My plot also has two of these lines at

the cyclist 2021-3-6

在 MATLAB Online 中打开

As described in the this documentation, fplot will display the asymptote of some functions. You can turn this behavior on or off with the 'showpoles' input:

figure

fplot (@(x) (x.^2 + 2)./(2*x-1), 'showpoles','on' )

figure

fplot (@(x) (x.^2 + 2)./(2*x-1), 'showpoles','off' )

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