Ignore elements in an array.

4 次查看（过去 30 天）
T
T 2012-10-16
Hi. I am to plot Value vs. Time using the following data from a databasefile which I haven't included. But the output looks like the following:
Value =
0.4100
0.2500
0.3340
0
0.5500
0.6250
0.7500
0.3330
0
Time =
1.0e+003 *
3.4018
3.4431
3.4507
3.4563
3.4585
3.4684
3.4793
3.4819
3.5181
Value = []; % create a 0-by-0 matrix
Time = [];
for i = 1:k
ValueID = ValueList(i,n);
if ValueID > 0 % some Value id's are negative or zero - these are irrelevant
index = find(ismember(cell2mat(Table1(:,1)),ValueID)==1); % locates the index
Output = Table{index,2};
ValueList(i,5) = Output; % Takes values from 5th column in databasefile
ValueList(i,6) = 39.3700787*gwdWt; % convert from metres to inches and takes values from sixth row in databasefile
%else
end
Value = [Value;ValueList(i,6)] % structures value as a row.
Time = [Time; ValueList(i,2)]
end
So what I am asking is, how do I ignore the following
0 and 3.4563,
also
0 and 3.5181?
Is that clear?

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采纳的回答

Matt Kindig
Matt Kindig 2012-10-16
Are Value and Time the same size? If so, you can just do this, using logical indexing (no loops):
deleteThese = (Value <= 0);
ValuesWithDeletions = Value(~deleteThese);
TimeWithDeletions = Time(~deleteThese);
  5 个评论
显示 3更早的评论
Matt Kindig
Matt Kindig 2012-10-16
What is a "discrete" plot vs. a "continuous" plot, in this context? Do you just mean a plot with connected points (i.e. lines), as opposed to just markers? If so, you can easily turn off the line to display only the "discrete" points. Do something like this:
plot(Time, Value, 'b.')
T
T 2012-10-16
编辑：T 2012-10-16
Actually stairs(Time,Value) gave me what I wanted.
Can you respond to my other thread?
http://www.mathworks.com/matlabcentral/answers/51019-synchronize-time-from-a-database-and-csv-file-and-plot

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