Contour plot of concentration of chemical species

조회 수: 52(최근 30일)
SS 2019년 11월 10일
댓글: Star Strider 2019년 11월 14일
Hi. I am releasing a chemical species CHX (N units) in a chamber. The size of the chamber is 100 X 100 X 100 cms^3. I want to plot the contour/surface plot of concentration of this chemical species in the chamber at different spatial locations.
I want to look at the concentration profiles overlapped or plotted on one plane, say X-Y plane (100 X 100 cm^2).
I am using a digital chemical analyzer which gives the X and Y vectors, X and Y which give the spatial location. Each and every (X,Y) corresponds to a spatial location at which the chemical species is present.
For example, if a given (X,Y) shows up "m" times it, means that there are "m" units of that species at that location. In my surface plot, at that particualr (X,Y), I want the value to be m/N (with some colormap). The same is with other (X,Y) locations.
Can someone help me with this?

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Star Strider
Star Strider 2019년 11월 10일
Try this example:
xy = randi(9, 100, 2); % Matrix Of ‘x’ and ‘y’ Positions
[Uxy,ia,ic] = unique(xy, 'rows'); % Unique Rows
tally = accumarray(ic, 1); % Tally Numbers Of Unique Row Repeats
Freq = [Uxy, tally]; % Concatenated Matrix
xv = min(xy(:,1)):max(xy(:,1)); % ‘x’ Vector For Interpolation
yv = min(xy(:,2)):max(xy(:,2)); % ‘y’ Vector For Interpolation
[X,Y] = ndgrid(xv,yv); % Create Interpolation Grid
Z = griddata(Freq(:,1), Freq(:,2), Freq(:,3), X, Y); % Interpolated Grid Of ‘tally’ Values
contourf(X, Y, Z) % Contour Plot
Experiment to get the result you want.
  댓글 수: 8
Star Strider
Star Strider 2019년 11월 14일
I am not certain that I understand what you are asking. The griddata function is necessary to create the matrices to do the contour plot. There are several different interpolation methods available in griddata, so perhaps one of them (perhaps 'nearest') is what you are looking for. (To the best of my knowledge, you cannot define your own interpolation scheme to use with griddata or the other interpolation algorithms.)

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