gibson:teaching:fall-2014:math445:lecture7-diary
====== Differences ====== This shows you the differences between two versions of the page.
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gibson:teaching:fall-2014:math445:lecture7-diary [2014/10/07 11:35] gibson [A few more bells and whistles] |
gibson:teaching:fall-2014:math445:lecture7-diary [2014/10/07 11:44] (current) gibson [A function with an if statement and fprintf] |
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| -The //body// of the function lies between the help string and the ''end''. Here the function body is a single line of code that calculates ''tempC'' from ''tempF''. | -The //body// of the function lies between the help string and the ''end''. Here the function body is a single line of code that calculates ''tempC'' from ''tempF''. | ||
| - | ====A few more bells and whistles==== | + | ====A function with an if statement and fprintf==== |
| That was an exceedingly simple function. Let's write the inverse function ''celsius2faren'' with a few more bells and whistles. Specifically, let's print a warning message if the input temperature is below absolute zero, -273.15 C. | That was an exceedingly simple function. Let's write the inverse function ''celsius2faren'' with a few more bells and whistles. Specifically, let's print a warning message if the input temperature is below absolute zero, -273.15 C. | ||
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| </code> | </code> | ||
| - | Things to note here: | + | This code includes an ''if'' statement that checks for temperatures below absolute zero. If the condition of the ''if'' statement evaluates to true, then the body of the ''if'' statement will be executed. If it evaluates to false, the body will be skipped, and execution will resume immediately after the ''end''. Thus here the warning message will be printed only if ''tempC'' is less than -273.15. |
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| + | The warning message is printed using the //formatted print function// ''fprintf''. ''fprintf'' takes a variable number of arguments. The first argument is always the ''format string''. The format string is simply a message to be printed with a number of slots into which values of variables will be substituted. The slots are marked with percent signs ''%'', and following the percents signs is a letter code that tells Matlab what type of variable to expect for the slot. Here ''%d'' tells Matlab to expect a decimal-valued variable (i.e. a floating-point number). After the format string, the remaining arguments to ''fprintf'' are the variables whose values you want substituted into those slots. | ||
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