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Saw the past post about generating random numbers from -100 to 100 but what if I needed to generate them from like -20 to -10? or 4.5 to 5? |
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Random numbers in MATLAB6
Started by ●November 7, 2002
Reply by ●November 8, 20022002-11-08
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Hi Bart, A simple way that would work is to use rand, to first generate a value from 0 to 1. To get a value from -20 to -10, multiply by 10 then subtract 20. To get a value from 4.5 to 5, multipily by 0.5 then add 4.5. Hope that helps, Quang Bart Hautala <> wrote:Saw the past post about generating random numbers from -100 to 100 but what if I needed to generate them from like -20 to -10? or 4.5 to 5? _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/matlab More DSP-Related Groups: http://www.dsprelated.com/groups.php3 ">http://docs.yahoo.com/info/terms/ |
Reply by ●November 8, 20022002-11-08
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Dear Hautala, There is a simple general formula for generating random numbers using the random function from Matlab. Supose you need to generate 100 random numbers with uniform distribution, beetween X1 and X2, where X1 and X2 are both real numbers. The Matlab command stands like this: random_vector = (x2-x1)*rand(1,100) + x1; Type 'help rand' for more details on the rand function. Best regards, Hugo ---- Hugo de Paula , Center for Research on Speech, Acoustics, Language and Music, UFMG ATR Human Information Science Lab 15-508 Takanohara-Ekinishi-Danchi, 1-2 Kabutodai, Kizu-cho, Souraku-gun, Kyoto 619-0224 Tel: +81-774-73-9849 (home) +81-774-95-2624 (office) ---- ----- Original Message ----- From: Bart Hautala To: Sent: Thursday, November 07, 2002 8:17 AM Subject: [matlab] Random numbers in MATLAB6 Saw the past post about generating random numbers from -100 to 100 but what if I needed to generate them from like -20 to -10? or 4.5 to 5? -- +++ GMX - Mail, Messaging & more http://www.gmx.net +++ NEU: Mit GMX ins Internet. Rund um die Uhr f 1 ct/ Min. surfen! |
Reply by ●November 8, 20022002-11-08
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Hai, You can use 'rand' function which generates random numbers from 0 to 1 and generate in which range you want. eg: To generate random numbers from -20 to -10 x = -20+10*rand will do To generate random numbers from 4.5 to 5 x = 4.5+rand/2 may solve the purpose. ...........Ananth. Bart Hautala <> wrote:Saw the past post about generating random numbers from -100 to 100 but what if I needed to generate them from like -20 to -10? or 4.5 to 5? _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/matlab More DSP-Related Groups: http://www.dsprelated.com/groups.php3 YOU MAY NOT LOVE YOUR ENEMY BUT PLEASE DON'T HATE HIM K.V.K.ANANTHANAG, R.NO:207,HOSTEL: DIHING, IIT GUWAHATI,GUWAHATI-781039. Phone:(0361)690763 |
Reply by ●November 8, 20022002-11-08
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> Saw the past post about generating random numbers from -100 to 100 > but what if I needed to generate them from like -20 to -10? or 4.5 > to 5? If you can generate random numbers between -100 and 100, then you can divide these numbers by 20 and subtract 10 from them to get something in the range-20 to -10, or by 400 and add 4.75 to get the range 4.5 to 5. In general if you want to generate numbers i the range x to y, divide your random num,bers which are between -100 and 100 by 200, multiply by y-x, and then add (y+x)/2 Tim |
