What does xlim() do in my code and why are its brackets empty?
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Hey guys,
I like adding a straight horizontal line at y = 0 to my plots therefore I am using the code shown below. It's working perfectly for my purposes so there is no need to change anything.
plot(x, z);
line(xlim(), [0,0], 'LineWidth', 1, 'Color', 'k', 'LineStyle','--');
grid on;
xlabel('This is the label for the x-axis')
ylabel('This is the label for the y-axis')
Since I found this code on the internet I am wondering what xlim() does in my code and why its brackets are empty?
Is there something generell to say about the function of empty round brackets () ?
Thanks for your help,
Best,
Sven
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采纳的回答
xlim()
The above takes the x-values based on the plot/ the input x you give. It will draw a line along x-axes in the range as the y-valyes are given to be zero.
Instead like givn, you can also use:
line([min(x) max(x)], [0,0], 'LineWidth', 1, 'Color', 'k', 'LineStyle','--');
3 个评论
Sven Krasel
2021-5-7
Sven Krasel
2021-5-7
Image Analyst
2021-5-7
That's not exactly right - that it goes from the min x to the max x. The graph goes from a left number that is "nice" to a right number that is "nice". So if your x goes from 1.34 to 117.123, xlim might make your graph go from 0 to 120 and xlim() would return [0, 120] instead of [1.34, 117.123].
So the line command would go from 0 to 120.
The way they did that, while it still works, can be done much simpler now. Instead of drawing a line at y=0 along the x axis,
line(xlim(), [0,0], 'LineWidth', 1, 'Color', 'k', 'LineStyle','--'); % Old way - unnecessarily complicated.
you can use yline
yline(0, 'LineWidth', 1, 'Color', 'k', 'LineStyle','--'); % New way is simpler
yline() draws a horizontal line at the specified y value.
xline() draws a vertical line at the specified x value.
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