MATLAB: Trouble with textread function

textread

I am trying to use textread but have encountered error msg as below:

[B,spc]=textread('DOTP.txt', '%f %f')

Error using dataread Trouble reading floating point number from file (row 1, field 1) ==>

Error in textread (line 176) [varargout{1:nlhs}]=dataread('file',varargin{:});

This is how my txt file looks like:

2800 -787.957031

2800.977539 -787.957031

2801.955078 -781.957031

2802.932617 -772.957031

2803.910156 -773.957031

2804.887695 -787.957031

2805.86499 -778.957031

2806.842529 -785.957031

What can I do to read the file? Thanks.

Best Answer

I've tried your codes with Matlab 2013a and it works well. What's your current release of Matlab?

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MATLAB: Does textread fails to read files which contain non-ASCII characters in their filename on MAC operating system

As mentioned in the documentation of 'textread' for MATLAB, it is recommended to avoid using 'textread' by using 'textscan' instead. The issue seen can be resolved by using 'textscan' instead of 'textread'. Please refer to the attached demo script. The only difference between the scripts is, the attached script uses 'textscan' to read from the file instead of 'textread'.

MATLAB: Exhaustion method with a condition

As pointed out by @John in the comments, you are getting this error because of finite precision of floating point numbers in the computer systems. A way around this is to compare numbers with tolerance. To do that here is one option, replace

if check == 0.25

with

if ismembertol(check, 0.25, 1e-6)

the third number to ismembertol() is the tolerance value i.e. how much difference from 0.25 on the left side of comparison will be considered equal to 0.25. For your code, this gives following a total of 13 combinations of weights

weight =
    0.1600    0.2600    0.2800    0.2800
    0.1600    0.2800    0.2600    0.2800
    0.1600    0.2800    0.2800    0.2600
    0.2500    0.2500    0.2500    0.2500
    0.2600    0.1600    0.2800    0.2800
    0.2600    0.2800    0.1600    0.2800
    0.2600    0.2800    0.2800    0.1600
    0.2800    0.1600    0.2600    0.2800
    0.2800    0.1600    0.2800    0.2600
    0.2800    0.2600    0.1600    0.2800
    0.2800    0.2600    0.2800    0.1600
    0.2800    0.2800    0.1600    0.2600
    0.2800    0.2800    0.2600    0.1600

If you increase the tolerance

if ismembertol(check, 0.25, 1e-3)

then even more elements will satisfy the equality. 1e-3 gives 61 points

weight =
    0.1600    0.2600    0.2800    0.2800
    0.1600    0.2700    0.2700    0.2800
    0.1600    0.2700    0.2800    0.2700
    0.1600    0.2800    0.2600    0.2800
    0.1600    0.2800    0.2700    0.2700
    0.1600    0.2800    0.2800    0.2600
    0.1900    0.2500    0.2700    0.2800
    0.1900    0.2500    0.2800    0.2700
    0.1900    0.2700    0.2500    0.2800
    0.1900    0.2700    0.2800    0.2500
    0.1900    0.2800    0.2500    0.2700
    0.1900    0.2800    0.2700    0.2500
    0.2400    0.2500    0.2500    0.2600
    0.2400    0.2500    0.2600    0.2500
    0.2400    0.2600    0.2500    0.2500
    0.2500    0.1900    0.2700    0.2800
    0.2500    0.1900    0.2800    0.2700
    0.2500    0.2400    0.2500    0.2600
    0.2500    0.2400    0.2600    0.2500
    0.2500    0.2500    0.2400    0.2600
    0.2500    0.2500    0.2500    0.2500
    0.2500    0.2500    0.2600    0.2400
    0.2500    0.2600    0.2400    0.2500
    0.2500    0.2600    0.2500    0.2400
    0.2500    0.2700    0.1900    0.2800
    0.2500    0.2700    0.2800    0.1900
    0.2500    0.2800    0.1900    0.2700
    0.2500    0.2800    0.2700    0.1900
    0.2600    0.1600    0.2800    0.2800
    0.2600    0.2400    0.2500    0.2500
    0.2600    0.2500    0.2400    0.2500
    0.2600    0.2500    0.2500    0.2400
    0.2600    0.2800    0.1600    0.2800
    0.2600    0.2800    0.2800    0.1600
    0.2700    0.1600    0.2700    0.2800
    0.2700    0.1600    0.2800    0.2700
    0.2700    0.1900    0.2500    0.2800
    0.2700    0.1900    0.2800    0.2500
    0.2700    0.2500    0.1900    0.2800
    0.2700    0.2500    0.2800    0.1900
    0.2700    0.2700    0.1600    0.2800
    0.2700    0.2700    0.2800    0.1600
    0.2700    0.2800    0.1600    0.2700
    0.2700    0.2800    0.1900    0.2500
    0.2700    0.2800    0.2500    0.1900
    0.2700    0.2800    0.2700    0.1600
    0.2800    0.1600    0.2600    0.2800
    0.2800    0.1600    0.2700    0.2700
    0.2800    0.1600    0.2800    0.2600
    0.2800    0.1900    0.2500    0.2700
    0.2800    0.1900    0.2700    0.2500
    0.2800    0.2500    0.1900    0.2700
    0.2800    0.2500    0.2700    0.1900
    0.2800    0.2600    0.1600    0.2800
    0.2800    0.2600    0.2800    0.1600
    0.2800    0.2700    0.1600    0.2700
    0.2800    0.2700    0.1900    0.2500
    0.2800    0.2700    0.2500    0.1900
    0.2800    0.2700    0.2700    0.1600
    0.2800    0.2800    0.1600    0.2600
    0.2800    0.2800    0.2600    0.1600

So it depends on how much tolerance is acceptable for your problem.

Best Answer

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