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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.
Areacirc function: The areacirc function can be called from the Command Window as shown here, or from a script. Here is a script which will prompt the user for the radius of o
Illustration of tracing a error: The one way of following the flow of function, or tracing it, is to use the echo function. The echo function, that is a toggle, will show each
Program of Persistent variables: The program below elaborates this. The script calls a function func1 that initializes a variable count to 0, then increment it, and print the
Index vector: The index vector is then used as the indices for original vector. To get grades vector in ascending order, the indices used would be grades (2), grades (5), and
The IF Statement: The if statement selects whether or not the other statement, or group of statements, is executed. The common form of the if statement is as shown below: i
Median The median is defined only for a data set which has been sorted first, that means that the values are in order. The median of a sorted set of data values (n) is defined
Use of function polyval: The better the curve fit, the more exact these interpolated and extrapolated values will be. By using the subplot function, we can loop to display the
Illustration of Indexing into vectors of structures: For illustration, the function to print the information from packages has been modified therefore in addition to the vecto
Illustration of Mode When there is more than one value with similar (highest) frequency, then the smaller value is mode. In the case below, as 3 and 8 appear twice in the vecto
Functions which complete a task without returning Values: Most of the functions do not compute values, but instead of accomplish a task like printing formatted output. As thes
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