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Math Forum / Math Software / MATLAB / July 2008Cyclomatic complexity also
Hello, There is another thread about C.C. going, so rather than hijack it I will start another. Can someone show me by example what this is really about? I am especially interested in how this relates to code length. I want to see a short code with high C.C., if that's possible. For example, say for simplicity: Score = CC(fcn)/numlines(fcn) What is the highest SCORE that can be achieved on purpose? I think this might help me understand this metric. Thanks. "Matt Fig" <spamanon@yahoo.com> wrote in message <g5iofa$pnv$1@fred.mathworks.com>... > Hello, > [quoted text clipped - 9 lines] > What is the highest SCORE that can be achieved on purpose? > I think this might help me understand this metric. Thanks. I think it is related to the number of if-else branches that you have in your code. Also, in my experience, switch statements can increase CC quite a bit, especially if there are many switch cases, a lot of code within each switch (with if-elses), or switches inside switches. Ken "Kenneth Eaton" <Kenneth.dot.Eaton@cchmc.dot.org> wrote in message <g5ipml$adk$1@fred.mathworks.com>... > "Matt Fig" <spamanon@yahoo.com> wrote in message > <g5iofa$pnv$1@fred.mathworks.com>... [quoted text clipped - 23 lines] > > Ken In my case i have 55 cases for switch-case but 11 cases are controlled by 7 different functions and the other 44 cases are controlled by 4 differnt functions. I guess i can see how i got such a high result! > In my case i have 55 cases for switch-case but 11 cases > are controlled by 7 different functions and the other 44 > cases are controlled by 4 differnt functions. I guess i > can see how i got such a high result! Wow, 55 switch cases is a lot. The most I had was 10-12 switch cases, with a lot of if-else laden code for each case, and I got CCs around the low 30s. Ken "Kenneth Eaton" <Kenneth.dot.Eaton@cchmc.dot.org> wrote in message <g5it3g$hv0$1@fred.mathworks.com>... > > In my case i have 55 cases for switch-case but 11 cases > > are controlled by 7 different functions and the other 44 [quoted text clipped - 6 lines] > > Ken do you think if i change the switch case to if then i will get a better CC number? "Markthomas " <uebermenchens@yahoo.com> wrote in message <g5itm5$p56$1@fred.mathworks.com>... > "Kenneth Eaton" <Kenneth.dot.Eaton@cchmc.dot.org> wrote in > message <g5it3g$hv0$1@fred.mathworks.com>... [quoted text clipped - 15 lines] > do you think if i change the switch case to if then i will > get a better CC number? I'm not totally sure what you mean when you say the cases are "controlled" by a certain number of functions. Do you have a lot of cases that encompass the exact same set of commands? If so, you can simplify this way: Original switch: switch stringValue, case 'a', myfcn1; case 'b', myfcn1; case 'c', myfcn1; ...(other cases)... end New switch: switch stringValue, case {'a' 'b' 'c'}, myfcn1; ...(other cases)... end I imagine this might help the CC score. Also, you can use the "otherwise" option for switch statements, which catches all other possibilities besides those you explicitly list as cases: switch stringValue, case 'a', myfcn1; case 'b', myfcn2; otherwise, myfcn3; end Hope that helps, Ken "Kenneth Eaton" <Kenneth.dot.Eaton@cchmc.dot.org> wrote in message <g5iuia$7d4$1@fred.mathworks.com>... > "Markthomas " <uebermenchens@yahoo.com> wrote in message > <g5itm5$p56$1@fred.mathworks.com>... [quoted text clipped - 62 lines] > Hope that helps, > Ken you are exactly right! Thanks i will try it out and post the results!! "Markthomas " <uebermenchens@yahoo.com> wrote in message <g5j4dp$bst$1@fred.mathworks.com>... > "Kenneth Eaton" <Kenneth.dot.Eaton@cchmc.dot.org> wrote in > message <g5iuia$7d4$1@fred.mathworks.com>... [quoted text clipped - 71 lines] > you are exactly right! Thanks i will try it out and post > the results!! one reason why it won't work for maybe 47 of the cases because the function outputs control all the variables such that each of the variables don't get mixed up... to get this to work i need to create indexed variables such that when i go through fcn1 the first time it outputs: BFL1 = BFL where BFL is <Yx1> vector then the second time it is BFL2 = BFL where BFL is <Vx1> i still can't get that problem right either! > one reason why it won't work for maybe 47 of the cases > because the function outputs control all the variables such > that each of the variables don't get mixed up... I can't understand that.. > to get this to work i need to create indexed variables such that when > i go through fcn1 the first time it outputs: [quoted text clipped - 5 lines] > > i still can't get that problem right either! Use cell arrays BFL{1} = BFL; BF2{2} = BFL; Or, for i=1:10 BFL{i} = some_function_that_generates_BFL; end -Peter Peter Boettcher <boettcher@ll.mit.edu> wrote in message <muyskuarnu7.fsf@G99-Boettcher.llan.ll.mit.edu>... > > one reason why it won't work for maybe 47 of the cases > > because the function outputs control all the variables such [quoted text clipped - 24 lines] > > -Peter I removed about 6 of the cases and it brought the CC down to 51 i am going to adjust the rest of my code to get the rest of the CC out! |
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