format hex a=12 The output you get is a long string of digits like 40XXXXXXXXXXXX (some digits) where as you expect to get C.
Also if a is a fraction, again you get a string of digits without any point in between. How to interpret this results?
MATLAB: How to interpret format hex displays
format hex
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In recent versions of matlab, the easiest would be to use detectImportOptions and override the relevant variable type to force it to char. However, R2015a predates detectImportOptions (introduced in R2016b). The only way for you to override the automatic type detection is to specify the 'Format' property in the readtable call. Unfortunately, that means you have to specify the format of all columns and know the exact number of columns rather than letting readtable work that out for you.
It would be something like:
data = readtable('yourfile', 'Format', '%f%f%s%s%f'); %for a file with 6 columns
where '%s' forces the corresponding column to be read as text regardless of its content.
The FORMAT function allows users to set the default display method for floating point numbers in MATLAB.
The options for format are:
FORMAT Default. Same as SHORT. FORMAT SHORT Scaled fixed point format with 5 digits. FORMAT LONG Scaled fixed point format with 15 digits. FORMAT SHORT E Floating point format with 5 digits. FORMAT LONG E Floating point format with 15 digits. FORMAT SHORT G Best of fixed or floating point format with 5 digits. FORMAT LONG G Best of fixed or floating point format with 15 digits. FORMAT HEX Hexadecimal format. FORMAT + The symbols +, - and blank are printed for positive, negative and zero elements. Imaginary parts are ignored. FORMAT BANK Fixed format for dollars and cents. FORMAT RAT Approximation by ratio of small integers. Spacing: FORMAT COMPACT Suppress extra line-feeds. FORMAT LOOSE Puts the extra line-feeds back in.For more information you should see the FORMAT documentation, accessible from MATLAB with the following command:
doc formatHere is a quick example:
>> format short>> pians = 3.1416>> format long>> pians = 3.14159265358979Currently, it is not possible to specify your own precision in MATLAB. A suggested work-around to this issue would be to use the CEIL and FLOOR functions, in combination with multiplication by magnitudes of 10, to round off to a particular precision.
For example, if you have a variable x = 3.1416, to obtain only three significant digits, you should do the following:
format shortx=pixtemp=x*1000xtempt=ceil(xtemp)x=xtempt/1000
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