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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by irismidas[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Operating System: Origin Pro 9.1 --------------------- Hi everyone I am having trouble fitting my data sets to a non-linear user defined function. Here is the function that I want the data to fit to [img]http://www.originlab.com/ftp/forum_and_kbase/Images/Fit_equation.png[/img] Here lamba,delta, Amax, Amin can be determined so the actual parameters for fitting are alpha, beta, and gamma This is what I expected the fitting function will do [img]http://www.originlab.com/ftp/forum_and_kbase/Images/Desired fitted function.png[/img] This is what I actually get [img]http://www.originlab.com/ftp/forum_and_kbase/Images/What I get.png[/img] Here is the raw data please help me out. -------------- 1.56399E-7 0.01142 1.56424E-7 0.01142 1.56449E-7 0.01142 1.56474E-7 0.01142 1.56499E-7 0.01145 1.56524E-7 0.01151 1.56549E-7 0.01159 1.56574E-7 0.01169 1.56599E-7 0.01182 1.56624E-7 0.01197 1.56649E-7 0.01215 1.56674E-7 0.01235 1.56699E-7 0.01258 1.56724E-7 0.01283 1.56749E-7 0.01311 1.56774E-7 0.01341 1.56799E-7 0.01373 1.56824E-7 0.01408 1.56849E-7 0.01445 1.56874E-7 0.01485 1.56899E-7 0.01527 1.56924E-7 0.01572 1.56949E-7 0.01619 1.56974E-7 0.01668 1.56999E-7 0.0172 1.57024E-7 0.01775 1.57049E-7 0.01832 1.57074E-7 0.01892 1.57099E-7 0.01955 1.57124E-7 0.02017 1.57149E-7 0.02081 1.57174E-7 0.02146 1.57199E-7 0.02213 1.57224E-7 0.02281 1.57249E-7 0.02351 1.57274E-7 0.02422 1.57299E-7 0.02496 1.57324E-7 0.02572 1.57349E-7 0.02651 1.57374E-7 0.02733 1.57399E-7 0.02819 1.57424E-7 0.02909 1.57449E-7 0.03003 1.57474E-7 0.03102 1.57499E-7 0.03206 1.57524E-7 0.03316 1.57549E-7 0.03431 1.57574E-7 0.03551 1.57599E-7 0.03677 1.57624E-7 0.03809 1.57649E-7 0.03947 1.57674E-7 0.0409 1.57699E-7 0.04239 1.57724E-7 0.04392 1.57749E-7 0.04551 1.57774E-7 0.04713 1.57799E-7 0.04878 1.57824E-7 0.05046 1.57849E-7 0.05216 1.57874E-7 0.05386 1.57899E-7 0.05556 1.57924E-7 0.05723 1.57949E-7 0.05887 1.57974E-7 0.06046 1.57999E-7 0.06198 1.58024E-7 0.06342 1.58049E-7 0.06476 1.58074E-7 0.06598 1.58099E-7 0.06706 1.58124E-7 0.068 1.58149E-7 0.06876 1.58174E-7 0.06934 1.58199E-7 0.06971 1.58224E-7 0.06988 1.58249E-7 0.06982 1.58274E-7 0.06953 1.58299E-7 0.06899 1.58324E-7 0.06821 1.58349E-7 0.06718 1.58374E-7 0.0659 1.58399E-7 0.06438 1.58424E-7 0.06262 1.58449E-7 0.06063 1.58474E-7 0.05843 1.58499E-7 0.05603 1.58524E-7 0.05345 1.58549E-7 0.05071 1.58574E-7 0.04784 1.58599E-7 0.04486 1.58624E-7 0.0418 1.58649E-7 0.03869 1.58674E-7 0.03556 1.58699E-7 0.03243 1.58724E-7 0.02934 1.58749E-7 0.02632 1.58774E-7 0.02339 1.58799E-7 0.02058 1.58824E-7 0.01791 1.58849E-7 0.01541 1.58874E-7 0.0131 1.58899E-7 0.011 1.58924E-7 0.00911 1.58949E-7 0.00746 1.58974E-7 0.00605 1.58999E-7 0.00489 1.59024E-7 0.00398 1.59049E-7 0.00333 1.59074E-7 0.00293 1.59099E-7 0.00278 1.59124E-7 0.00287 1.59149E-7 0.00319 1.59174E-7 0.00373 1.59199E-7 0.00447 1.59224E-7 0.00541 1.59249E-7 0.00651 1.59274E-7 0.00777 1.59299E-7 0.00917 1.59324E-7 0.01068 1.59349E-7 0.01229 1.59374E-7 0.01398 1.59399E-7 0.01574 1.59424E-7 0.01754 1.59449E-7 0.01937 1.59474E-7 0.02121 1.59499E-7 0.02305 1.59524E-7 0.02488 1.59549E-7 0.02668 1.59574E-7 0.02844 1.59599E-7 0.03016 1.59624E-7 0.03182 1.59649E-7 0.03342 1.59674E-7 0.03495 1.59699E-7 0.03641 1.59724E-7 0.0378 1.59749E-7 0.03912 1.59774E-7 0.04036 1.59799E-7 0.04154 1.59824E-7 0.04264 1.59849E-7 0.04369 1.59874E-7 0.04469 1.59899E-7 0.04564 1.59924E-7 0.04655 1.59949E-7 0.04743 1.59974E-7 0.04829 1.59999E-7 0.04914 1.60024E-7 0.04999 1.60049E-7 0.05084 1.60074E-7 0.05171 1.60099E-7 0.05259 1.60124E-7 0.05348 1.60149E-7 0.0544 1.60174E-7 0.05535 1.60199E-7 0.05631 1.60224E-7 0.05729 1.60249E-7 0.05828 1.60274E-7 0.05929 1.60299E-7 0.06029 1.60324E-7 0.0613 1.60349E-7 0.06229 1.60374E-7 0.06327 1.60399E-7 0.06422 1.60424E-7 0.06514 1.60449E-7 0.06601 1.60474E-7 0.06685 1.60499E-7 0.06764 1.60524E-7 0.06837 1.60549E-7 0.06905 1.60574E-7 0.06966 1.60599E-7 0.07022 1.60624E-7 0.07071 1.60649E-7 0.07114 1.60674E-7 0.07151 1.60699E-7 0.07182 1.60724E-7 0.07208 1.60749E-7 0.07227 1.60774E-7 0.07242 1.60799E-7 0.07252 1.60824E-7 0.07257 1.60849E-7 0.07259 1.60874E-7 0.07257 1.60899E-7 0.07252 1.60924E-7 0.07245 1.60949E-7 0.07236 1.60974E-7 0.07225 1.60999E-7 0.07214 1.61024E-7 0.07202 1.61049E-7 0.07191 1.61074E-7 0.07179 1.61099E-7 0.07169 1.61124E-7 0.07159 1.61149E-7 0.0715 1.61174E-7 0.07142 1.61199E-7 0.07136 1.61224E-7 0.0713 1.61249E-7 0.07125 1.61274E-7 0.07122 1.61299E-7 0.07119 1.61324E-7 0.07116 1.61349E-7 0.07114 1.61374E-7 0.07112 1.61399E-7 0.0711 1.61424E-7 0.07108 1.61449E-7 0.07105 1.61474E-7 0.07101 1.61499E-7 0.07097 1.61524E-7 0.0709 1.61549E-7 0.07082 1.61574E-7 0.07071 1.61599E-7 0.07058 1.61624E-7 0.07041 1.61649E-7 0.07021 1.61674E-7 0.06997 1.61699E-7 0.06968 1.61724E-7 0.06934 1.61749E-7 0.06896 1.61774E-7 0.06853 1.61799E-7 0.06804 1.61824E-7 0.0675 1.61849E-7 0.06692 1.61874E-7 0.06628 1.61899E-7 0.06559 1.61924E-7 0.06485 1.61949E-7 0.06407 1.61974E-7 0.06325 1.61999E-7 0.06239 1.62024E-7 0.0615 1.62049E-7 0.06058 1.62074E-7 0.05963 1.62099E-7 0.05866 1.62124E-7 0.05767 1.62149E-7 0.05667 1.62174E-7 0.05566 1.62199E-7 0.05465 1.62224E-7 0.05364 1.62249E-7 0.05264 1.62274E-7 0.05164 1.62299E-7 0.05067 1.62324E-7 0.04971 1.62349E-7 0.04877 1.62374E-7 0.04785 1.62399E-7 0.04696 1.62424E-7 0.04609 1.62449E-7 0.04525 1.62474E-7 0.04443 1.62499E-7 0.04364 1.62524E-7 0.04287 1.62549E-7 0.04212 1.62574E-7 0.0414 1.62599E-7 0.04069 1.62624E-7 0.04001 1.62649E-7 0.03934 1.62674E-7 0.03869 1.62699E-7 0.03806 1.62724E-7 0.03744 1.62749E-7 0.03684 1.62774E-7 0.03624 1.62799E-7 0.03566 1.62824E-7 0.03508 1.62849E-7 0.0345 1.62874E-7 0.03392 1.62899E-7 0.03334 1.62924E-7 0.03275 1.62949E-7 0.03215 1.62974E-7 0.03154 1.62999E-7 0.03092 1.63024E-7 0.03029 1.63049E-7 0.02965 1.63074E-7 0.029 1.63099E-7 0.02834 1.63124E-7 0.02767 1.63149E-7 0.02699 1.63174E-7 0.02632 1.63199E-7 0.02564 1.63224E-7 0.02497 1.63249E-7 0.0243 1.63274E-7 0.02364 1.63299E-7 0.023 1.63324E-7 0.02237 1.63349E-7 0.02176 1.63374E-7 0.02116 1.63399E-7 0.02059 1.63424E-7 0.02004 1.63449E-7 0.0195 1.63474E-7 0.01899 1.63499E-7 0.01851 1.63524E-7 0.01804 1.63549E-7 0.0176 1.63574E-7 0.01718 1.63599E-7 0.01678 1.63624E-7 0.0164 1.63649E-7 0.01604 1.63674E-7 0.01569 1.63699E-7 0.01536 1.63724E-7 0.01505 1.63749E-7 0.01475 1.63774E-7 0.01446 1.63799E-7 0.01418 1.63824E-7 0.01392 1.63849E-7 0.01366 1.63874E-7 0.01342 1.63899E-7 0.01318 1.63924E-7 0.01295 1.63949E-7 0.01273 1.63974E-7 0.01251 1.63999E-7 0.0123 1.64024E-7 0.01209 1.64049E-7 0.01189 1.64074E-7 0.01169 1.64099E-7 0.01149 1.64124E-7 0.01129 1.64149E-7 0.0111 1.64174E-7 0.01091 1.64199E-7 0.01072 1.64224E-7 0.01053 1.64249E-7 0.01035 1.64274E-7 0.01017 1.64299E-7 0.00999 1.64324E-7 0.00981 1.64349E-7 0.00964 1.64374E-7 0.00947 1.64399E-7 0.0093 1.64424E-7 0.00913 1.64449E-7 0.00897 1.64474E-7 0.00881 1.64499E-7 0.00865 1.64524E-7 0.00849 1.64549E-7 0.00834 1.64574E-7 0.00819 1.64599E-7 0.00804 1.64624E-7 0.00789 1.64649E-7 0.00775 1.64674E-7 0.00761 1.64699E-7 0.00747 1.64724E-7 0.00734 1.64749E-7 0.00721 1.64774E-7 0.00709 1.64799E-7 0.00697 1.64824E-7 0.00686 1.64849E-7 0.00676 1.64874E-7 0.00666 1.64899E-7 0.00657 1.64924E-7 0.00648 1.64949E-7 0.0064 1.64974E-7 0.00633 1.64999E-7 0.00627 1.65024E-7 0.00621 1.65049E-7 0.00616 1.65074E-7 0.00612 1.65099E-7 0.00608 1.65124E-7 0.00605 1.65149E-7 0.00602 1.65174E-7 0.006 1.65199E-7 0.00598 1.65224E-7 0.00597 1.65249E-7 0.00596 1.65274E-7 0.00595 1.65299E-7 0.00595 1.65324E-7 0.00595 1.65349E-7 0.00595 1.65374E-7 0.00595 1.65399E-7 0.00596 1.65424E-7 0.00597 1.65449E-7 0.00598 1.65474E-7 0.00599 1.65499E-7 0.006 1.65524E-7 0.00602 1.65549E-7 0.00604 1.65574E-7 0.00606 1.65599E-7 0.00607 1.65624E-7 0.00609 1.65649E-7 0.00611 1.65674E-7 0.00612 1.65699E-7 0.00614 1.65724E-7 0.00615 1.65749E-7 0.00616 1.65774E-7 0.00618 1.65799E-7 0.00619 1.65824E-7 0.0062 1.65849E-7 0.00621 1.65874E-7 0.00623 1.65899E-7 0.00624 1.65924E-7 0.00625 1.65949E-7 0.00627 1.65974E-7 0.00628 1.65999E-7 0.00629 1.66024E-7 0.00629 1.66049E-7 0.0063 1.66074E-7 0.0063 1.66099E-7 0.00629 1.66124E-7 0.00629 1.66149E-7 0.00628 1.66174E-7 0.00627 1.66199E-7 0.00626 1.66224E-7 0.00625 1.66249E-7 0.00624 1.66274E-7 0.00623 1.66299E-7 0.00622 1.66324E-7 0.00621 1.66349E-7 0.0062 1.66374E-7 0.00619 1.66399E-7 0.00618 1.66424E-7 0.00618 1.66449E-7 0.00617 1.66474E-7 0.00617 1.66499E-7 0.00617 1.66524E-7 0.00617 1.66549E-7 0.00618 1.66574E-7 0.00618 1.66599E-7 0.00619 1.66624E-7 0.0062 1.66649E-7 0.00622 1.66674E-7 0.00624 1.66699E-7 0.00626 1.66724E-7 0.00628 1.66749E-7 0.0063 1.66774E-7 0.00632 1.66799E-7 0.00634 1.66824E-7 0.00635 1.66849E-7 0.00637 1.66874E-7 0.00638 1.66899E-7 0.00639 1.66924E-7 0.0064 1.66949E-7 0.00641 1.66974E-7 0.00642 1.66999E-7 0.00643 1.67024E-7 0.00643 1.67049E-7 0.00645 1.67074E-7 0.00646 1.67099E-7 0.00647 1.67124E-7 0.00649 1.67149E-7 0.00651 1.67174E-7 0.00652 1.67199E-7 0.00654 1.67224E-7 0.00655 1.67249E-7 0.00656 1.67274E-7 0.00657 1.67299E-7 0.00657 1.67324E-7 0.00656 1.67349E-7 0.00656 1.67374E-7 0.00655 1.67399E-7 0.00654 1.67424E-7 0.00653 1.67449E-7 0.00652 1.67474E-7 0.00651 1.67499E-7 0.0065 1.67524E-7 0.0065 1.67549E-7 0.0065 1.67574E-7 0.0065 1.67599E-7 0.00651 1.67624E-7 0.00652 1.67649E-7 0.00654 1.67674E-7 0.00655 1.67699E-7 0.00657 1.67724E-7 0.00659 1.67749E-7 0.00661 1.67774E-7 0.00664 1.67799E-7 0.00666 1.67824E-7 0.00668 1.67849E-7 0.00671 1.67874E-7 0.00673 1.67899E-7 0.00676 1.67924E-7 0.00679 1.67949E-7 0.00683 1.67974E-7 0.00686 1.67999E-7 0.0069 1.68024E-7 0.00694 1.68049E-7 0.00699 1.68074E-7 0.00703 1.68099E-7 0.00707 1.68124E-7 0.00712 1.68149E-7 0.00716 1.68174E-7 0.0072 1.68199E-7 0.00725 1.68224E-7 0.00729 1.68249E-7 0.00733 1.68274E-7 0.00737 1.68299E-7 0.00742 1.68324E-7 0.00747 1.68349E-7 0.00751 1.68374E-7 0.00757 1.68399E-7 0.00762 1.68424E-7 0.00768 1.68449E-7 0.00773 1.68474E-7 0.00779 1.68499E-7 0.00786 1.68524E-7 0.00792 1.68549E-7 0.00798 1.68574E-7 0.00804 1.68599E-7 0.0081 1.68624E-7 0.00815 1.68649E-7 0.00821 1.68674E-7 0.00826 1.68699E-7 0.0083 1.68724E-7 0.00835 1.68749E-7 0.00839 1.68774E-7 0.00843 1.68799E-7 0.00847 1.68824E-7 0.0085 1.68849E-7 0.00854 1.68874E-7 0.00857 1.68899E-7 0.00861 1.68924E-7 0.00865 1.68949E-7 0.00868 1.68974E-7 0.00872 1.68999E-7 0.00876 1.69024E-7 0.0088 1.69049E-7 0.00883 1.69074E-7 0.00887 1.69099E-7 0.00891 1.69124E-7 0.00894 1.69149E-7 0.00897 1.69174E-7 0.009 1.69199E-7 0.00902 1.69224E-7 0.00904 1.69249E-7 0.00905 1.69274E-7 0.00906 1.69299E-7 0.00907 1.69324E-7 0.00907 1.69349E-7 0.00906 1.69374E-7 0.00906 1.69399E-7 0.00905 1.69424E-7 0.00905 1.69449E-7 0.00904 1.69474E-7 0.00904 1.69499E-7 0.00905 1.69524E-7 0.00906 1.69549E-7 0.00907 1.69574E-7 0.00909 1.69599E-7 0.00911 1.69624E-7 0.00913 1.69649E-7 0.00916 1.69674E-7 0.00919 1.69699E-7 0.00922 1.69724E-7 0.00925 1.69749E-7 0.00929 1.69774E-7 0.00933 1.69799E-7 0.00937 1.69824E-7 0.00942 1.69849E-7 0.00947 1.69874E-7 0.00952 1.69899E-7 0.00957 1.69924E-7 0.00963 1.69949E-7 0.00969 1.69974E-7 0.00975 1.69999E-7 0.00982 1.70024E-7 0.00989 1.70049E-7 0.00996 1.70074E-7 0.01003 1.70099E-7 0.01011 1.70124E-7 0.0102 1.70149E-7 0.01028 [/quote]   Check here to include your profile signature. 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