July 29, 2014

Debugging Function Comparison RLanguage v.s. esProc

As is well known, in the development process of program, the time consumed to remove and correct the error is usually greater than time spent in coding. Therefore, a friendly debug environment can save a lot of time. In this respect, VB.NET and SQL are two extremes that the former provides almost a perfect Debug environment, while the latter nearly provides no error debugging tool.
R language and esProc as two development tools for computation and analysis are both capable to debug to some degree. We will study on their differences in this respect.

Let’s kick off by making ourselves familiar with the debugging environments of both R (take R Studio for example) and esProc from their respective interfaces:

R Studio Debugging Environment:
esProc's Debugging Environment


Let's compare the basic functions. 
Break point: For R, the break point is set by inserting browser () into the codes. Users have to remove these statements manually once debugged, which seems to be  back to the cherished old times of using BASIC to code when Windows was not invented, impressed us with a strong feeling of reminiscence. In those days, removing the stop break point statement is even an important job before releasing codes. By comparison, the break point style of esProc is similar to that of VB.NET and other alike modern programming languages. By clicking the button or pressing shortcut keys, the break point can be set to the cell in which the mouse cursor is located. This is nothing special.

Debug command: with the same style of break point, debug command of R is input from the console, including to resume running,n to go run the next statement, and Q to exit the debug mode. In addition, there are also functions like trace/set Break point/debug/undebug/stop.It is important to note that it would be best not to have any variable named after c, n, and Q in the codes. Otherwise, accidental conflicts will occur.

Regarding the procedure control, esProc is no different than VB.net and like programming languages for just requires click(s) on button or shortcut keys to implement, not requiring users to memorize any command, as we all know. 

Variable watch: The variable watch window of R language is on the right, in which all current variables will be listed. On clicking it, a new window will prompt to display the value of this variable. Alternatively, R language users can also enter the fix(variable name) at the command line window as shown below. In the right bottom corner of esProc user interface, there is a similar variable list. Seldom do esProc users use this list because esProc does not require users to specially define the variable name. The name of cell is taken as the variable name by default, and thus users can simply click the cell to review the variable value. 

One thing to notice is that R is friendly to display the variables of Frame format. However, it is comparatively not so friendly to support the irregularly-structured variables that we can say it is unreadable at all, as the below typical List for example:

esProc does a much better job in this respect. For the same data, in esProc, it is represented by drilling through the hyperlinks:

Then, let’s compare some more advanced functions, and start from checking the Immediate Running first.

As for esProc, a cell will be calculated immediately and automatically once codes are entered into this cell. Therefore, the developers can view the execution result immediately and adjust the code for re-run on conditions. This style can speed up the development speed and lower the probability of errors, allowing the green hand to become familiar with it quickly. R Studio provides the similar means that more resembles the "immediate window" of VB, that is,user's type in codes at a command line window and run immediately. If it is run correctly, then copy the codes to the formal code section. Judging on the whole, R is less convenient than esProc in this respect.

Finally, let us discuss the function to debug the functions separately.

R users can use the debug(Function Name) to debug the functions separately and directly so as to modularize in development and implement the large-scale test. esProc users,on the contrary, are not allowed to debug the function separately, which is a pity more or less. However, the debug function of R language has not implemented the true “separate” test. Its working principle is actually to add a browser () command prior to the function to be debugged, still requiring running all codes before entering the function to debug. 

From another perspective, such computational analysis software is rarely used for the large-scale development and test. There is not much significance and value for its ability to debug function separately. 

Through the above comparison, we can see that both R and esProc provide some debugging functions. In which,esProc is performing better in terms of convenience and usability.

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