How to use FIND function here?
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Chathu
am 13 Feb. 2015
Bearbeitet: per isakson
am 25 Feb. 2015
I need to find the very first corresponding value of the payload when time is 0.0000.
Next,find the corresponding value of payload when time is 1.000.Likewise when time is 2.0000 and time is 3.0000. (pls note that payload column needs to convert to decimal values) [file is attached, herewith]
below is the code i used so far:
clc
clear all
fid=fopen('test.txt');
data=textscan(fid, '%*d%f%*s%*s%*s%*d%s', 40 ...
, 'MultipleDelimsAsOne',true, 'HeaderLines',1);
fclose(fid);
S=hex2dec(data{:,7});
Any suggestions?
2 Kommentare
per isakson
am 13 Feb. 2015
"corresponding value of payload when time is 1.000."   closest to 1 or by integration or what does "corresponding" mean?
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per isakson
am 13 Feb. 2015
Bearbeitet: per isakson
am 25 Feb. 2015
"I need to get 1st and 3rd column as my output."   Is this what you want?
fid=fopen('test.txt');
data=textscan(fid, '%*d%f%*s%*s%*s%*d%s', 40 ...
, 'MultipleDelimsAsOne',true, 'HeaderLines',1);
fclose(fid);
S = hex2dec(data{2});
my_output = cat( 2, data{1}, S );
>> whos my_output
Name Size Bytes Class Attributes
my_output 40x2 640 double
"How to use FIND function here?"   I cannot see how find could be used here.
 
Addendum with inputs from the comments
Add the following lines to the script above.
sbs = floor(my_output(:,1)) + 1;
val = accumarray( sbs, my_output(:,2), [], @mean );
t1 = accumarray( sbs, my_output(:,1), [], @min );
t2 = accumarray( sbs, my_output(:,1), [], @max );
out = [ t1, t2, val ];
fprintf( '%g, %g, %g\n', transpose( out ) )
The script will now output
0, 0.998058, 4.39375e+12
1.09832, 1.99722, 4.39375e+12
2.09746, 2.99636, 4.39375e+12
3.09557, 3.89427, 4.39375e+12
 
A second addendum with inputs from the comments
Replace
val = accumarray( sbs, my_output(:,2), [], @mean );
by
first_value = @(vec) vec(1);
val = accumarray( sbs, my_output(:,2), [], first_value );
to get "very first corresponding value of the payload".
From testing and the documentation I understand that accumarray does not keep the order of the input values.
Correction: "does not keep" should be "does keep". If not, the function, first_value would be useless.
9 Kommentare
per isakson
am 21 Feb. 2015
In the original question you say "find the very first corresponding value". I had forgotten that when I wrote @mean. Does "real values" refer to this "first [...] value"?
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