Don't want my points on the boundary

Question

David Epstein 2019-4-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/459347-don-t-want-my-points-on-the-boundary

评论： Alex Mcaulley 2019-4-30

采纳的回答： Alex Mcaulley

在 MATLAB Online 中打开

This code puts my points on the boundary of the plot , which

I don't want. Have tried setting xlim large, and various

other approaches. Any enlargement would help.

close all;
s = 2;
ss = -s:s;
[x,y] = meshgrid(ss);
plot(x,y,'ko');
hold on;
xticks([-s-1:s+1])

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Alex Mcaulley 2019-4-30

在 MATLAB Online 中打开

This code should work:

s = 2;
ss = -s:s;
[x,y] = meshgrid(ss);
plot(x,y,'ko');
hold on;
xlim([-3,3])
ylim([-3,3])
xticks(ss)
yticks(ss)

David Epstein 2019-4-30

@Alex Mcaulley: If you want to turn your code as an Answer, and add a caution about clearing variables and closing images, I will upvote/accept or whatever. When I tried your code and it still didn't work on my machine, I suddenly twigged. I then preceded your code with

close all; clear all

and then, hallelujah!!, it worked as expected.

Explanation: I had early misused xlim, and Matlab was convinced it was the name of an array,

rather than a function. Would have been nice if Matlab had issued a warning.

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Answer 1

Alex Mcaulley 2019-4-30

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/459347-don-t-want-my-points-on-the-boundary#answer_372990

在 MATLAB Online 中打开

Here we are:

s = 2;
ss = -s:s;
[x,y] = meshgrid(ss);
plot(x,y,'ko');
hold on;
xlim([-3,3])
ylim([-3,3])
xticks(ss)
yticks(ss)

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Alex Mcaulley 2019-4-30

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Probably you had any definition as:

xlim = [-3,3]

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Answer 2

KSSV 2019-4-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/459347-don-t-want-my-points-on-the-boundary#answer_372951

在 MATLAB Online 中打开

s = 2;
dx = 0.5 ;   % can be changed to your desired offset 
ss = -s+dx:s-dx;
[x,y] = meshgrid(ss);
plot(x,y,'ko');
hold on;
xticks([-s-1:s+1])

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David Epstein 2019-4-30

This gives x with non-integer entries.

Also, when I specify the ticks and the x and y values

I want all of these to be visible on the plot, with the (x,y) points not on the boundary

David Epstein 2019-4-30

@KSSV: your answer points to a possible solution by using invisible points. This would presumably work (I haven't yet tried it), but, in my opinion, if such a solution is necessary, it would show a defect in Matlab.

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