Help with logical indexing

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Barry
Barry 2020-12-18
回答： Rishabh Mishra 2020-12-21
Hi All,
i have a question about logical indexing.
I have an array of three columns called pressure. Firstly, i check for values < 1000 (low = pressure < 1000) and then i would like to give those values new RGB values [0.1, 0.5, 0.9] so i can create a RGB pressure map.
i tried pressure(low) = [0.1, 0.5, 0.9] but this obviously didnt work. pressure(low) = 0.9 is working but is not the prefered outcome.
Any idead how this might work? Or do i have apply every column seperately like this: pressure(low, 1) = 0.1, pressure(low, 2) = 0.5 ... and so on?
Regards,
Barry
  1 个评论
KALYAN ACHARJYA
KALYAN ACHARJYA 2020-12-18
"values < 1000 (low = pressure < 1000)"
Please carify?
  • For for individual coloums or all columns have to satisfy
  • How does you get thease R,G,B values 0.1, 0.5, 0.9
If you want help, then you need to make it easy to be helped.
:)

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回答（1 个）

Rishabh Mishra
Rishabh Mishra 2020-12-21
Hi,
You can use cell arrays (instead of double arrays) along with loop operations to work out the issue. Use the code below for the purpose,
% Pressure Matrix
pressure = [1101 450 987;1213 145 1997;148 1533 1420];
low = pressure < 1000;
RGB = {0.1 0.5 0.9};
% Convert Matrix to 2D Cell Array
pressure = num2cell(pressure);
% Replace Pressure values < 1000 by RGB cell
for k = 1:size(low,1)
for j = 1:size(low,2)
if low(k,j)
pressure{k,j} = RGB;
end
end
end
Hope this helps.

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