but our numbers do not match for other reasons I'm not sure what to believe.Įxample code of the second method is included in a previous answer (including a lot of overlap with this question), as well as some timing results. Your file probably contains 49 lines or less, so everything ends up being discarded. The character '1' is interpreted as its ASCII value, 0x31 (49 decimal), so the first 49 lines are skipped. readtable determines the file format from the file extension. I have found this is slightly faster than either textscan of fscanf. 1 Answer Sorted by: 3 I think your problem is that you have specified a string instead of an integer value for HeaderLines. Description example T readtable (filename) creates a table by reading column oriented data from a file. textscan imports file data into one cell array, the contents of which are one or more arrays (numeric, cell, datetime, etc), where their number of rows. You can do that be first reading a large batch of characters, then either backing up until you reach a line break, or reading in additional characters until you find the end of the line. textscan converts the numeric fields from the field content to the output type according to the conversion specifier and MATLAB rules regarding overflow and. For example, the integer NaNis represented as zero in MATLAB. The only trick is that you need to get your read batches to end on a line break, otherwise your text-to-string operation is likely to give unpredictable results. Textscan ()is designed to convert numeric fields to a specific output type, following MATLAB rules with respect to the process of overflow, truncation, and the application of NaN, Inf, and -Inf. Otherwise you can read characters using fread and then run a string-to-number conversion on the incoming data (sscanf seems to be the best). (String-to-number conversions are expensive, and a raw binary format will result in a much smaller file). I would expect fread to be a lot faster in that case. I would expect fread to be a lot faster in that case. Andrey Rubshtein 20.8k 11 67 104 asked at 3:53 Maddy 2,520 14 44 64 Add a comment 2 Answers Sorted by: 0 Ideally you would be able to get your data into a binary format and then use fread to directly read double precision number in. The fscanf function reapplies the format throughout the entire file and positions the file pointer at the end-of-file marker. Ideally you would be able to get your data into a binary format and then use fread to directly read double precision number in. A fscanf (fileID,formatSpec) reads data from an open text file into column vector A and interprets values in the file according to the format specified by formatSpec.
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