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Find index of specific rows of a table with value greater than a threshold

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Apurva Godbole
Apurva Godbole 2020 年 5 月 27 日
回答済み: Chaitanya Mallela 2020 年 8 月 18 日
Hey, I have a data table (143 x 8). From this table, for column 8, I want to search row numbers 72 to 112, for values greater than 0.54. I want to then use these indices to give these points a different color in my scatter plot. I am currently using find:
ind2 = find(T{72:112,8} > 0.5426) %Correctly classified test points
ind3 = find(T{113:143,8} < 0.5426) %Correctly classified test points
scatter(X1(ind1),Y1(ind1),'b','filled') %Cal data is blue
scatter(X1(ind2),Y1(ind2),'g','filled') %Correctly classified data is green
scatter(X1(ind3),Y1(ind3),'g','filled') %Correctly classified data is green
scatter(X1(69),Y1(69),'k','filled')
hold off
The ind2 output is : 1 2 4 5 6 8 10 etc
i.e. it tells me that starting from the 72nd row, the 1st value meets my criteria (> 0.54), the 2nd does, the 3rd does not and so on, which I verified is correct. But I want to now the row index, in order to shade the accurate points in the plot!
The find works fine with variables, i.e. it outputs the row number. I don't know the issue with tables :(
Please help!

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回答 (1 件)

Chaitanya Mallela
Chaitanya Mallela 2020 年 8 月 18 日
Try the code by adding (initial index - 1) to the find function
ind = find(T{initial_index:final_index,column_index} > threshold) + (initial_index - 1)

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