Re: [Scilab-users] Booeleans : irrelevant results ?
Dear Paul, The behaviour of test 2 may come from the order in which the operations are performed : Note that (a c b) ~= (b c a), indeed : - a c b performs a c which returns [] and then [] b which returns [], - b c a performs b c which returns %t and then %t [] which returns %t. You can obtain the desired behaviour by adding parenthesis b (c a) returns [] but it may be safer to use isempty() to check whether a variable is empty or not. Best regards, Pierre Le 27.08.2015 12:29, Carrico, Paul a écrit : Dear All, I wondering what I'm doing wrong in the examples here bellow: - Test 1 à M returns False that's ok for me - Test 2 à should return False as well, shouldn't be ? - Test 3 à another test using directly a Boolean instead of an empty form [] - Test 4 à as expected, it returns F Thanks for any highlight Paul ## mode(0) _// test 1_ M = []; if M then printf(M returns T\n); else printf(M returns F\n); end _// test 2_ a=[]; b=30; c=200; if (b c a) then printf(val = 6\n); else printf(val = []\n); _// should return [] ??_ end _// test 3_ tmp = %f; _//tmp = %t;_ if (tmp) then printf(tmp returns T\n); else printf(tmp returns F\n); end _// test 4_ t1 = %t; t2 = %t; _//t3 = %t;_ t3 = %f; if (t1 t2 t3) then printf((t1,t2,t3) returns T\n); else printf((t1,t2,t3) returns F\n); end EXPORT CONTROL : Cet email ne contient pas de données techniques This email does not contain technical data ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users [1] Links: -- [1] http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
[Scilab-users] Booeleans : irrelevant results ?
Dear All, I wondering what I'm doing wrong in the examples here bellow: - Test 1 -- M returns False that's ok for me - Test 2 -- should return False as well, shouldn't be ? - Test 3 -- another test using directly a Boolean instead of an empty form [] - Test 4 -- as expected, it returns F Thanks for any highlight Paul ## mode(0) // test 1 M = []; if M then printf(M returns T\n); else printf(M returns F\n); end // test 2 a=[]; b=30; c=200; if (b c a) then printf(val = 6\n); else printf(val = []\n); // should return [] ?? end // test 3 tmp = %f; //tmp = %t; if (tmp) then printf(tmp returns T\n); else printf(tmp returns F\n); end // test 4 t1 = %t; t2 = %t; //t3 = %t; t3 = %f; if (t1 t2 t3) then printf((t1,t2,t3) returns T\n); else printf((t1,t2,t3) returns F\n); end EXPORT CONTROL : Cet email ne contient pas de données techniques This email does not contain technical data ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Booeleans : irrelevant results ?
Effectively it is much better to use isempty() function (or ~isempty() in the current case) … I didn’t know it so far Many thanks for your help Paul EXPORT CONTROL : Cet email ne contient pas de données techniques This email does not contain technical data De : Pierre Vuillemin [mailto:cont...@pierre-vuillemin.fr] Envoyé : jeudi 27 août 2015 13:08 À : Users mailing list for Scilab Cc : Carrico, Paul Objet : Re: [Scilab-users] Booeleans : irrelevant results ? Dear Paul, The behaviour of test 2 may come from the order in which the operations are performed : Note that (a c b) ~= (b c a), indeed : - a c b performs a c which returns [] and then [] b which returns [], - b c a performs b c which returns %t and then %t [] which returns %t. You can obtain the desired behaviour by adding parenthesis b (c a) returns [] but it may be safer to use isempty() to check whether a variable is empty or not. Best regards, Pierre Le 27.08.2015 12:29, Carrico, Paul a écrit : Dear All, I wondering what I’m doing wrong in the examples here bellow: - Test 1 -- M returns False that’s ok for me - Test 2 -- should return False as well, shouldn’t be ? - Test 3 -- another test using directly a Boolean instead of an empty form [] - Test 4 -- as expected, it returns F Thanks for any highlight Paul ##” mode(0) // test 1 M = []; if M then printf(M returns T\n); else printf(M returns F\n); end // test 2 a=[]; b=30; c=200; if (b c a) then printf(val = 6\n); else printf(val = []\n); // should return [] ?? end // test 3 tmp = %f; //tmp = %t; if (tmp) then printf(tmp returns T\n); else printf(tmp returns F\n); end // test 4 t1 = %t; t2 = %t; //t3 = %t; t3 = %f; if (t1 t2 t3) then printf((t1,t2,t3) returns T\n); else printf((t1,t2,t3) returns F\n); end EXPORT CONTROL : Cet email ne contient pas de données techniques This email does not contain technical data ___ users mailing list users@lists.scilab.orgmailto:users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/usershttps://urldefense.proofpoint.com/v2/url?u=http-3A__lists.scilab.org_mailman_listinfo_usersd=AwMFaQc=0hKVUfnuoBozYN8UvxPA-wr=4TCz--8bXfJhZZvIxJAemAJyz7Vfx78XvgYu3LN7eLom=CsJzSea7OehSm_fgX8J6czbmq4kUd-ws1o3meFqpHeks=EFhyGA5WXCbkAbKVE545SI6VDStjViqsaNYDJ3bW3uwe= ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
