how to label an array having a range of values with only two texts

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I have a range of values in an array such as (1:89) and I want to label them as either oranges or apples depending on a threshold assigned in their PDF??
BR on 14 Aug 2017
Edited: BR on 14 Aug 2017
I want to create a data set like Fisher iris dataset. But the division of colors should be on the basis of a threshold assigned in the PDF for the datset (as an example 1000 rand values between 1-50).
Like the values above a certain threshold should be labelled as RED and the values below the threshold as ORANGE.

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Accepted Answer

Walter Roberson
Walter Roberson on 14 Aug 2017
YourArray = randi(89, 1, 1000);
magic_threshold = 0.01381972;
[uvals, ~, uidx] = unique(YourArray);
portions = accumarray(uidx, 1) ./ length(YourArray);
is_orange = portions < magic_threshold;
cmap = [255 165 0; 141 182 0] ./ 255; %orange; apple green
item_type = 2 - is_orange(uidx); %true for orange maps to index 1, false maps to index 2;
item_color = cmap(item_type, :);
dot_size = 24;
x = 1 : length(YourArray);
scatter(x, YourArray, dot_size, item_color);
orange_mask = item_type == 1;
text(x(orange_mask), YourArray(orange_mask), 'orange');
text(x(~orange_mask), YourArray(~orange_mask), 'apple');
The output is nearly unreadable because of all of the text objects, which would tend to suggest that labeling might not be the best of ideas.
Walter Roberson
Walter Roberson on 18 Aug 2017
You generate some measure of the separation, somehow, and then you test it against whatever threshold, creating a mask similar to is_orange that tells you which group each individual item belongs to. Then you follow along with the rest of the logic I show above to display the items and to text() the appropriate label into place.

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