No it's 1 plant with 5 different roots growing and I have that type of graph for each plant but I don't in know advance how many roots there will be for each plant Yes it's expressed in thermal time, it represent the accumulation of the temperature of each day, the plants are more influenced by temperature than time. But we can interpret that like the growth of the roots of one plant over time. Yes it's the spatial position in 2D of the tip of a root for a given thermal time (degday). But the image processing software does not always detect the tip since sometimes the roots can overlap. And Yes eucl = sqrt(X**2 + Y**2) What I'm trying to do is to put together in a group each line (that would represent a root) since in my data there is nothing differenciating them (and then after it will allow me to calculate each growth curve for each roots). And I realise that the cluster method might not be the best to put together points strung in a line. Do you know any other method that might be more suited to do that?
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