How to use FIND function here?

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Chathu
Chathu 2015-2-13
编辑： per isakson 2015-2-25
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 个评论
per isakson
per isakson 2015-2-13
"corresponding value of payload when time is 1.000." &nbsp closest to 1 or by integration or what does "corresponding" mean?
Chathu
Chathu 2015-2-13
@ per isakson- oh...sorry for the confusion.
time payload converted value(used hex2dec fun for the payload col)
0.0000 03ff00000166 2.1518*1.0e+12
. ..... ........
. ..... .......
1.0993 03ff00000171 2.1518*1.0e+12
. ..... ....
. .... ....
2.0974 01f60000011a 2.1561*1.0e+12
Here, what i meant was: i need to get 1st and 3rd column as my output. Any idea how to solve it?

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per isakson
per isakson 2015-2-13
编辑：per isakson 2015-2-25
"I need to get 1st and 3rd column as my output." &nbsp 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?" &nbsp I cannot see how find could be used here.
&nbsp
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
&nbsp
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 个评论
显示 7更早的评论
per isakson
per isakson 2015-2-21
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"?
Chathu
Chathu 2015-2-25
@ per isakson- Just now saw this message. Thanks ALOT for your response. It is very kind of you to reply me even after accepting your answer. Your genuine support is truly admired. Yes, with your help i managed to solve my qu. Keep up the good work. Thanks!

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