MATLAB Filling in the area between two sets of data lines in one figure

Question

I have a question about using the area function  or perhaps another function is in order    I created this plot from a large text file     The green and the blue represent two different files  What I want to do is fill in the area between the red line and each run  respectively  I can create an area plot with a similar idea  but when I plot them on the same figure  they do not overlap correctly  Essentially  4 plots would be on one figure   I hope this makes sense

User · Answer

You want to look at the patch   function  and sneak in points for the start and end of the horizontal line   x   0  1 2 pi  y   sin x  rand size x   2   x2    0 x 2 pi   y2     1 y  1   patch x2  y2    8  8  1      If you only want the filled in area for a part of the data  you ll need to truncate the x and y vectors to only include the points you need

User · Answer

You can accomplish this using the function FILL to create filled polygons under the sections of your plots  You will want to plot the lines and polygons in the order you want them to be stacked on the screen  starting with the bottom-most one  Here s an example with some sample data   x   1 100                 X range y1   rand 1 100  1 5      One set of data ranging from 1 5 to 2 5 y2   rand 1 100  0 5      Another set of data ranging from 0 5 to 1 5 baseLine   0 2            Baseline value for filling under the curves index   30 70             Indices of points to fill under  plot x y1  b                                    Plot the first line hold on                                         Add to the plot h1   fill x index  1 1 end end                  Plot the first filled polygon            baseLine y1 index  baseLine                 b   EdgeColor   none    plot x y2  g                                    Plot the second line h2   fill x index  1 1 end end                  Plot the second filled polygon            baseLine y2 index  baseLine                 g   EdgeColor   none    plot x index  baseLine  ones size index    r        Plot the red line   And here s the resulting figure     You can also change the stacking order of the objects in the figure after you ve plotted them by modifying the order of handles in the  Children  property of the axes object  For example  this code reverses the stacking order  hiding the green polygon behind the blue polygon   kids   get gca  Children              Get the child object handles set gca  Children  flipud kids        Set them to the reverse order   Finally  if you don t know exactly what order you want to stack your polygons ahead of time  i e  either one could be the smaller polygon  which you probably want on top   then you could adjust the  FaceAlpha  property so that one or both polygons will appear partially transparent and show the other beneath it  For example  the following will make the green polygon partially transparent   set h2  FaceAlpha  0 5

User · Answer

Personally  I find it both elegant and convenient to wrap the fill function  To fill between two equally sized row vectors Y1 and Y2 that share the support X  and color C    fill between lines     X Y1 Y2 C  fill   X fliplr X      Y1 fliplr Y2    C

User · Answer

Building off of  gnovice s answer  you can actually create filled plots with shading only in the area between the two curves  Just use fill in conjunction with fliplr   Example   x 0 0 01 2 pi                     initialize x array y1 sin x                          create first curve y2 sin x   5                      create second curve X  x fliplr x                     create continuous x value array for plotting Y  y1 fliplr y2                   create y values for out and then back fill X Y  b                       plot filled area     By flipping the x array and concatenating it with the original  you re going out  down  back  and then up to close both arrays in a complete  many-many-many-sided polygon

[matlab] MATLAB, Filling in the area between two sets of data, lines in one figure

Examples related to matlab

Examples related to plot

Examples related to fill

Examples related to area