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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 Forum: Origin 中文论坛 (Chinese Origin Forum) Subject: Message: * HTML is OFF * Forum Code is ON Smilies Origin Ver. and Service Release (Select Help-->About Origin):OriginPro 2021b (64-bit) 9.8.5.201 (学习版) Operating System: Win 10 有两个问题请问：（1）对origin里面现有的公式进行改造，参数初始化应该如何修改？例如我将y = (a1/(a1-a2))*(exp(-a2*x) - exp(-a1*x))改为y = (φa1*a2/(a1-a2))*(exp(-a2*x) - exp(-a1*x)) （2）[img]https://my.originlab.com/ftp/forum_and_kbase/Images/%e5%85%ac%e5%bc%8f.png[/img]，其中ε（t）= [(a1/(a1-a2))*(exp(-a2*t) - exp(-a1*t))]/(1 - exp(-a1*t))，这样的公式应该如何自己编辑？