Significant figures are being trimmed when I read from a .txt file

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Karoly Fodor
Karoly Fodor 2016-9-2
编辑： Stephen23 2016-9-2
Hello, and thank you in advance for your time.
I am trying to read data from text files. The first column contains absolute time, so the data points look something like this: 3.55560341707837150E+9. However, the data is being truncated to show only this: 3.5556e+09.
It is very important that I use all of the digits, as I need to look at very small increments of time between certain points.
Here is the code I use to access the files:
[fileName1,filePath1] = uigetfile('*', 'Select force data file', '.');
force = load( fullfile(filePath1,fileName1) );
[fileName2,filePath2] = uigetfile('*', 'Select lvdt data file', '.');
volt = load( fullfile(filePath2,fileName2) );
In what way could I alter this code to ensure that all significant figures are read?
  1 个评论
Stephen23
Stephen23 2016-9-2
编辑：Stephen23 2016-9-2
"the data is being truncated to show only this"
Yes, it only shows that. But the data is stored in MATLAB's memory as a full double floating point value, which means 15-17 significant digits.

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回答（2 个）

Stephen23
Stephen23 2016-9-2
编辑：Stephen23 2016-9-2
Your data is there, this is just a question of how it is displayed. Read the format documentation for other display precisions:
>> 3.55560341707837150E+9
ans =
3.5556e+09
>> format longg
>> 3.55560341707837150E+9
ans =
3555603417.07837
>> format longe
>> 3.55560341707837150E+9
ans =
3.555603417078372e+09
Star Strider
Star Strider 2016-9-2
You’re limited to 16 significant figures in MATLAB double-precision variables:
format long
Q1 = 3.55560341707837150E+9
Q1 =
3.555603417078372e+09

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