How to plot a different colored area of negative and positive elements in an array?

Hey guys: Can you please help me to get my goal? my goal will be listed below. 1) Plot a 2D area of the all elements in an array. x-axis and y-axis are the order of array and the value of each element. 2)The area has two colors because the values can be positive or negative.In other words, the color is separated by x-axis 3)The different colored area is connected. The area in my pic is unconnected.

This is my code(I mean the code is wrote by myself but the hints from someone else in community, thanks dude) :

clear all,clc
% random data,my real data has more than 10k elements
Data=[3,4,-4,5,1,-4,-2,1,5,5];
% length of the array
Length=[1:10];
% threshold is zero
base=Data>0;
% 2 arrays have the same data as Data
above=Data;
below=Data;
% change the ceratin data to be nan
above(~base)=nan;
below(base)=nan;
% plot
% % The area is unconnected, that is main part of my question
area(Length,above,'FaceColor','r');
hold on
area(Length,below,'FaceColor','b');

Answer 1

[Scott MacKenzie]

Fang: Did you find a good solution? I've been working on this issue recently. Here's an approach that works well. The trick is to first expand your data through interpolation and then use the area function. Do this and the transitions are smooth.

% your example data
Data =[3 4 -4 5 1 -4 -2 1 5 5];

x = 1:length(Data);

% interpolate to get smoother +/- transitions
n = 1000; 
x9 = linspace(1,length(x),n);
y9 = interp1(x,Data,x9);

above = y9;
below = y9;

above = above .* (above >= 0);
below = below .* (below <= 0);

area(x9, above, 'FaceColor', 'r');
hold on;
area(x9, below, 'FaceColor', 'b');

[Sergio Yanez-Pagans]

Great solution!

Answer 2

[KL]

use area https://de.mathworks.com/help/matlab/ref/area.html

 pos = Data;
 pos(pos<0)=nan;
 neg = Data;
 neg(neg<0)=nan;
 area(pos)
 hold on
 area(neg)

[Fang Huang]

Thank you for your answer. But what is the difference between yours and mine?