Plotting two columns from matrix.
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I am trying to plot Column 4 against Column 10 as a line plot, but only when Columns 8 and 9 are between 0 +/- 0.0005. (Columns 8, 9, 10 are x, y, and z locations).
I would have done this with two if loops which would print the row if the conditions were met. This could have then been plotted. I feel as there are over 400,000 entries this is inefficient (file attached represents a smaller quantity due to size constraints). Prealloaction is not possible as I don't know the size of the final array. What would the best way to go about this?
2 个评论
Walter Roberson
2020-1-1
In the cases where the conditions are not met, what do you want to do? Are you wanting to do a scatter plot? Are you wanting to plot a disconnected line segment for each consecutive area where the conditions are met? Are you wanting to create a single line plot as if the entries that do not met the condition were not present at all ?
JLV
2020-1-1
采纳的回答
per isakson
2020-1-1
编辑：per isakson
2020-1-1
A starter
%%
M = dlmread('matrix.txt');
%%
is_show = abs(M(:,8))<5e-4 & abs(M(:,9))<5e-4;
%%
figure
plot( M(is_show,10), M(is_show,4), '.' )
3 个评论
JLV
2020-1-2
Walter Roberson
2020-1-2
编辑：per isakson
2020-1-3
x = M(is_show,8);
y = M(is_show,9);
z = M(is_show,4);
Finterp = scatteredInterpolant(x, y, z);
xmin = min(M(:,8));
xmax = max(M(:,8));
ymin = min(M(:,9));
ymax = max(M(:,9));
N = 500;
xrange = linspace(xmin, xmax, N);
yrange = linspace(ymin, ymax, N);
[XGrid, YGrid] = meshgrid(xrange, yrange);
ZGrid = Finterp(XGrid, YGrid);
contourf(XGrid, YGrid, ZGrid);
xlabel('M 8');
ylabel('M 9');
zlabel('M 4');
JLV
2020-1-4
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