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Advanced File Input and output:
Where 'format' involves the conversion characters much like those used in the fprintf function. For illustration, to read the file 'subjexp.dat' just shown, we can do the following (again, for ease, omitting the error-check of fopen & fclose):
>> fid = fopen('subjexp.dat');
>> subjdata = textscan(fid,'%f %c');
>> fclose(fid)
The format string '%f %c' identifies that on each line there is a double value followed by the space followed by the character. This generates a 1 × 2 cell array variable known as the subjdata. The initial element in this cell array is a column vector of doubles (the initial column from the file); the next element is a column vector of characters (the next column from the file), as shown here:
>> subjdata
subjdata =
[5x1 double] [5x1 char]
>> subjdata{1}
ans =
5.3000
2.2000
3.3000
4.4000
1.1000
>> subjdata{2}
a
b
To refer to separate values from the vector, it is essential to index into the cell array by using curly braces and then index into the vector by using the parentheses.
Example of Vectorizing: Likewise, for an operation on a matrix, a nested loop would be needed; for illustration, supposing a matrix variable mat: [r c] = size(mat); for
Nested Structures: The nested structure is a structure in which at least one of the members is itself a structure. For illustration, a structure for the line segment may co
Core Objects: The Core Objects in MATLAB are the very fundamental graphics primitives. The description can be found under the MATLAB Help: Under the Contents tab, click the Ha
Example of customizing plots: As the other illustration of customizing plots, the pieces of a pie chart can be "exploded" from the rest. In this situation, the two vectors are
Curve Fitting: The data is fundamentally either discrete or continuous. In most of the applications, data is sampled, for illustration, The temperature recorded every ho
Sorting Strings: For the matrix of strings, the sort function works exactly as formerly for numbers. For illustration, >> words = char('Hi', 'Hello', 'Howdy', 'Goodbye', '
Execution of persistent variables: The functions can also be called from the script or from the Command Window, as shown here. For illustration, the functions are called first
Debugging Techniques: Any error in the computer program is called a bug. This word is thought to date back to the 1940s, whenever a problem with an early computer was found to
fopen function - file function: The fopen opens the file for reading. The fscanf then reads each line one double and one character, and put each pair in individual columns in
Lower Level File I/O Functions: Whenever reading from data file, as long as the data in the file is "regular" the load function works-in another words, the similar type of dat
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