Fill between two lines not working
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I am trying to fill the between the lines but its is only plotting the limiting lines. I cant seem to understand the problem. Hope you can help. Thanks in advance.
figure(2)
semilogx((f_Along)*(0.1/WS),f_Along.*((PSD_AL_M))/WSP^2,'Color',...
'k','LineWidth',2)
hold on
semilogx((f_Along)*(0.1/WS),f_Along.*((SD_AL_P))/WSP^2,'Color',...
[0.7 0.7 0.7],'LineWidth',2,'DisplayName','STD+')
hold on
semilogx((f_Along)*(0.1/WS),f_Along.*((SD_AL_N))/WSP^2,'Color',...
[0.7 0.7 0.7],'LineWidth',2,'DisplayName','STD-')
hold on
x2 = [(f_Along')*(0.1/WS), fliplr((f_Along')*(0.1/WS))];
inBetween = [f_Along'.*((SD_AL_P'))/WSP^2, fliplr(f_Along'.*((SD_AL_N'))/WSP^2)]
fill(x2, inBetween, 'k');
hold on
3 个评论
Walter Roberson
2020-4-9
We will probably need your variables to test with.
Walter Roberson
2020-4-10
It would be easier if we had your data so we could test on our own system to avoid accidentally giving you a solution that does not work for your situation.
Saugat Shrestha
2020-4-10
回答（1 个）
Star Strider
2020-4-9
0 个投票
Plot everything (including the patch calls) using linear axis rulers first, then convert the scale to logarithmic.
.
8 个评论
Saugat Shrestha
2020-4-10
Star Strider
2020-4-10
It is necessary to plot in the linear scale, including the patch calls, then do:
set(gca, 'XScale','log')
Example —
x = logspace(-2, 1, 250);
y = sin(2*pi*x);
hi = y + 0.2;
lo = y - 0.2;
figure
plot(x, y)
hold on
patch([x, fliplr(x)], [hi fliplr(lo)], 'r', 'FaceAlpha',0.25)
hold off
grid
set(gca, 'XScale','log')
Run this example, then apply it to your code.
Saugat Shrestha
2020-4-10
I still get the same problem. It appears in the linear scale. But doesnt appear in the log scale.
Walter Roberson
2020-4-10
what is min() of the y coordinates of the data you are trying to fill between?
Saugat Shrestha
2020-4-10
Walter Roberson
2020-4-10
fill() creates a 2D patch with a continuous edge.
In MATLAB, when you use patch() on a log scale, then any face that has a coordinate of 0, or a negative number, or nan, in it is not drawn. The edges that are entirely within the limits would still be drawn, though. This leads to situations where the edge of a fill area is drawn but the area is not filled.
This is happening to you because your first and last x2 coordinates are 0. Based on your sample graphs you probably want to use max(1e-4,x2) as the x coordinates.
Star Strider
2020-4-10
@Saugat Shrestha — It would have helped to have had your data at the outset. As Walter points out, the problem is that ‘f_Along’ begins with 0. Since log(0) appraches -Inf, the transformation fails for patch.
Add before you create ‘figure(2)’:
f_Along = f_Along + eps;
and after the patch (or fill) call:
xlim([f_Along(2) f_Along(end)])
set(gca, 'XScale','log')
@Walter — Thank you.
.
Saugat Shrestha
2020-4-11
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