Legend giving different colour

2015 8 30
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更新时间：2015 8 30
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I have attached pictures of my problem, as you can see i am plotting 4 lines (which are cells) of colour, yellow, red, green and black. The plotting isnt the issue, but the legend gives all the same colour (yellow)
which makes it hard to distinguish. Can someone help me?

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Walter Roberson
Walter Roberson 2015-8-30
Are you using R2014b or later, or are you using R2014a or earlier? The behavior of "hold on" changed in R2014b so we need to know which of the two situations we are dealing with.
Saurabh Sakpal
Saurabh Sakpal 2015-8-30
I am using 2014b walter robertson

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Geoff Hayes
Geoff Hayes 2015-8-30

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Saurabh - what can you tell us about the dimensions of t_cell{i} and Act_6{i}? Are both arrays, or are one or both matrices?
Or, even better, if you do the following
h = plot(t_cell{i}, Act_6{i}, 'y');
what is h? Typically, the behaviour you describe above is due to the fact that more than one graphics object has been plotted with your single call to plot (which usually happens when one or both of your inputs to plot is a matrix). In your case, at least four may have been plotted. As h will contain all of the handles to the graphics objects called by plot, then if the dimension of this array is greater than one then that will explain the problem.

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Saurabh Sakpal
Saurabh Sakpal 2015-8-30
Ok i put h = plot(...) in front of all 4 plot lines and since they are the output of a Diff Equation solver (earlier in the code) each 'plot' line is off different length.
Geoff Hayes
Geoff Hayes 2015-8-30
Just do this for the first plot that colours the graphics object in yellow. What is assigned to h?
Saurabh Sakpal
Saurabh Sakpal 2015-8-30
t_cell{i) and Act_6{i} are outputs of a differential equation, they are vectors (arrays) not matrix.
Saurabh Sakpal
Saurabh Sakpal 2015-8-30
This was the output i got for h for the first plot line i asked. Thanks
Saurabh Sakpal
Saurabh Sakpal 2015-8-30
Some further info on t_cell{1} and Ac_6{1}
Geoff Hayes
Geoff Hayes 2015-8-30
Saurabh - so that is the problem. Your Act_6{1} is a matrix and you are in fact drawing 23 lines instead of one. (The same may be true for your other three lines too.) Is each column of Act_6{1} identical? If so, then just use the first column when plotting this line (since all 23 lines would then be identical).
Saurabh Sakpal
Saurabh Sakpal 2015-8-30
No not all columsn are indentical, all columns are 0, except 11. COlumns 11 all values are roughly 0.99. This is just for Act_6{1} for Act_6(2) (3) and (4) they also have only one non zero column the rest all zero, but they are different dimension amtrices and the non zero column are different numbers.
Saurabh Sakpal
Saurabh Sakpal 2015-8-30
For eg. ok Ac_6{1) ia 23*23 by only column 11 has non zero values,
for Act_6{2} only column 34 of 46 (46*46 matrix) is non zero and some other values for Act_6{3,4}. How do i extract the non zero component for each case?
Saurabh Sakpal
Saurabh Sakpal 2015-8-30
Thanks a lot geoff frr pointing me in the right direction, i managed to isolated the matrices and i got the right answer :)

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