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getting min and max for different y-values of a graph

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soloby
soloby 2015-6-23
评论： Walter Roberson 2015-6-25
x = -10:0.1:10;
f1 = trapmf(x,[-2 0 0 2]);
I need to find min(x),max(x) for 201 different f1 values
since my f1 ranges from 0 to 1 in this built in function
@ f1 = 0, I need a min(x), max(x)
@ f1 = 0.05, min(x), max(x)
..
all the way upto
@f1 = 1, min(x), max(x).

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回答（1 个）

Walter Roberson
Walter Roberson 2015-6-23
testlocs = 0:0.05:1;
t = bsxfun(@ge, f1(:), testlocs);
for K = 1 : size(t, 1)
minidx = find(t(K,:), 1, 'first');
maxidx = find(t(K,:), 1, 'last');
minx(K) = testlocs(minidx);
maxx(K) = testlocs(maxidx);
end
  2 个评论
soloby
soloby 2015-6-23
i'm sorry I dont follow your coding, what is minx? it gives me a 1x201 matrix with all 0's.
Walter Roberson
Walter Roberson 2015-6-25
testlocs = 0:0.05:1;
t = bsxfun(@le, testlocs(:), f1(:)');
for K = 1 : size(t, 1)
minidx = find(t(K,:), 1, 'first');
maxidx = find(t(K,:), 1, 'last');
minx(K) = testlocs(minidx);
maxx(K) = testlocs(maxidx);
end

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