Use the repetition factor with the skip argument to extract data in noncontiguous fields from fixed-length records. If a skip argument is not specified, the repetition factor is ignored. When skip is specified, fread reads in, at most, a repetition factor number of values (default is 1), skips the amount of input specified by the skip argument, reads in another block of values, again skips input, and so on, until count number of values have been read. The format string '40*uchar' is equivalent to '40*uchar=>double', not '40*uchar=>uchar'. When skip is used, the precision string can contain a positive integer repetition factor of the form 'N*', which prefixes the source format specification, such as '40*uchar'.Дo not confuse the asterisk (*) used in the repetition factor with the asterisk used as precision format shorthand. Read in doubles, convert, and save as a 32-bit floating-point array. Each 4-bit integer becomes an 8-bit integer. Read in signed 4-bit integers packed in bytes and save them in a signed 8-bit array. Read in unsigned 8-bit integers and save them in an unsigned 8-bit integer array. This table shows some example precision format strings. If the source and destination formats are the same, the following shorthand notation can be used.ДЇor example, '*uint16' is the same as 'uint16=>uint16'. fread translates the name to the most appropriate MATLAB class type. You are not required to use the exact name of a MATLAB class type for destination. To return numeric values stored in classes other than double, create your precision argument by first specifying your source format, then following it with the characters ' =>', and finally specifying your destination format. The following formats map to an input stream of bits rather than bytes.Д«y default, numeric values are returned in class double arrays. The following platform-dependent formats are also supported, but they are not guaranteed to be the same size on all platforms. If precision is not specified, MATLAB uses the default, which is 'uchar'. n can be specified as inf, but m cannot.ДЄny of the strings in the following table, either the MATLAB version or their C or Fortran equivalent, can be used for precision. Reads enough elements to fill an m-by- n matrix, filling in elements in column order, padding with zeros if the file is too small to fill the matrix. If using inf results in an 'out of memory' error, specify a numeric count value. Reads to the end of the file, resulting in a column vector containing the same number of elements as are in the file. Returns the data read from the file in A, and the number of elements successfully read in count. You can obtain the machineformat argument from the output of the fopen function. Treats the data read as having a format given by machineformat. If precision specifies a bit format like 'bitN' or 'ubitN', the skip argument is interpreted as the number of bits to skip. Includes an optional skip argument that specifies the number of bytes to skip after each precision value is read. See Specifying Precision and Specifying Output Precision, below. This argument commonly contains a data type specifier such as int or float, followed by an integer giving the size in bits. Reads the file according to the data format specified by the string precision. For example, fread(fid, precision) is a valid syntax. In the following syntaxes, the count and skip arguments are optional. See Specifying the Number of Elements, below. A subsequent fread will begin at the location of the file pointer. At the end of the fread, MATLAB sets the file pointer to the next byte to be read. Reads the number of elements specified by count. When reading text files, use the fgetl function. Note fread is intended primarily for binary data. MATLAB reads the file from beginning to end, and then positions the file pointer at the end of the file (see feof for details). The fid argument is the integer file identifier obtained from the fopen operation. Open the file using fopen before calling fread. Reads data in binary format from the file specified by fid into matrix A. Fread (MATLAB Functions) MATLAB Function ReferenceДЄ = fread(fid, count, precision, skip, machineformat)

Reading files in matlab