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hai I tred to create a pulse waveform from 200 samples of 1 with this code samples=sign(randn(200,1)); plot(samples(1:200)). But i am not getting correct result.Is there any other way to do it |
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create a pulse waveform from 200 samples of 1
Started by ●November 22, 2002
Reply by ●November 23, 20022002-11-23
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What do you expect to get? It will be easier to view if you use stem. -----Original Message----- From: sreejyothi jonnalagadda [mailto:] Sent: Friday, November 22, 2002 10:22 AM To: Subject: [matlab] create a pulse waveform from 200 samples of 1 hai I tred to create a pulse waveform from 200 samples of 1 with this code samples=sign(randn(200,1)); plot(samples(1:200)). But i am not getting correct result.Is there any other way to do it _____________________________________ 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 |
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Reply by ●November 25, 20022002-11-25
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sreejyothi, it's better if you do this: y = round(rand(1,200)); stem(y) -----Original Message----- From: sreejyothi jonnalagadda [mailto:] Sent: Friday, November 22, 2002 10:22 AM To: Subject: [matlab] create a pulse waveform from 200 samples of 1 hai I tred to create a pulse waveform from 200 samples of 1 with this code samples=sign(randn(200,1)); plot(samples(1:200)). But i am not getting correct result.Is there any other way to do it _____________________________________ 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 _____________________________________ 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 Louis Angeles BS Electrical Engineering George Mason University |
Reply by ●November 25, 20022002-11-25
Reply by ●November 25, 20022002-11-25
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Hi: First of all, as far as I remember sign function gives you out -1,0 and 1 value depending on the inout value. Randn function gerenerates random valuse varies from [-1 1 ], then the output you see will have some many signum(t) function (signal processing). Anyway if you expain the probelem clearly then we can help yo more. thota |
Reply by ●November 27, 20022002-11-27
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Hi, samples=sign(randn(200,1)); The output depends on the random numbers. And if you have not set the seed value or state of the random generator each time you run the program you will get different output. Also, you will get a pulse waveform of varying pulse width because it just depends on the random numbers. If you would like to create a pulse waveform of varying pulse width then the above statement with little modification will give you the same results each time you run the program. randn('state',S) where S is some state Eg:randn('state',33333) samples=sign(randn(200,1)); Or else if you would like to create a pulse waveform of some fixed pulse width, for Eg:For 5 samples it should be 1, next 15 samples it should be 0 and then for next 5 samples it should be -1 then again zero for 15 samples. x = [ones(1,5) zeros(1,15) -1*ones(1,5) zeros(1,15)]; Now totally you have 40 samples. You can make it 200 samples by repetition of the same for 5 times. i,e., samples = [x x x x x]; You can change the pulse width as it suits your requirement. Regards, Malini ------ *Disclaimer* "This e-mail and any attachments are confidential and may contain trade secrets or privileged or undisclosed information. They may also be subject to copyright protection. Please do not copy, distribute or forward this email to anyone unless authorised. If you are not a named addressee, you must not use, disclose, retain or reproduce all or any part of the information contained in this e-mail or any attachments. If you have received this email by mistake please notify the sender immediately by return email and destroy/delete all copies of the email." -----Original Message----- From: sreejyothi jonnalagadda [mailto:] Sent: Friday, November 22, 2002 11:52 PM To: Subject: [matlab] create a pulse waveform from 200 samples of 1 hai I tred to create a pulse waveform from 200 samples of 1 with this code samples=sign(randn(200,1)); plot(samples(1:200)). But i am not getting correct result.Is there any other way to do it _____________________________________ 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/ |
