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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 xuwenyu[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 8.0 SR0 Operating System:Windows 7 I have read the tutorial on how to fitting with complex function, but my situation is different.My ydata are all real type ,they don't have imaginery parts,and my function has imaginary unit "i". something about fitting function as follows: Parameters:m,l,n,c Independent Variables: x Dependent Variables: y Function: y = (1i*(m^2-1)*tan(pi*x*l*(2-1i*n)/c))/(2*m+ 1i*(m^2+1)*tan(pi*x*l*(2-1i*n)/c)); then I compile it,the result show that: Linking... Done! compiling... _nlffashexishu.fit D:\Program Files\OriginLab\Origin8\XXX\OriginC\NLSF\_nlffashexishu.fit(37) :Error, Incompatible variable types in expression D:\Program Files\OriginLab\Origin8\XXX\OriginC\NLSF\_nlffashexishu.fit(37) :Error, general compile error D:\Program Files\OriginLab\Origin8\XXX\OriginC\NLSF\_nlffashexishu.fit(28) :Error, error(s) found in compiling function _nlsffashexishu Compile Failed! I am not good at English and not well versed in Origin C, so hope you can understand what I say and any code snippets would be extremely helpful. Thanks. my date is that: x y 50 0.52 55 0.365 60 0.133 65 0.467 70 0.621 75 0.62 80 0.414 85 0.347 90 0.623 95 0.6 100 0.456 105 0.112 110 0.549 115 0.658 120 0.619 125 0.378 130 0.312 135 0.593 140 0.651 145 0.585 150 0.212 155 0.371 160 0.523 165 0.558 170 0.278 175 0.121 180 0.403 185 0.511 190 0.446 195 0.177 200 0.201 205 0.459 210 0.458 215 0.292 220 0.147 225 0.354 230 0.429 235 0.185 240 0.075 245 0.24 250 0.333 255 0.211 260 0.044 265 0.235 270 0.364 275 0.29 280 0.115 285 0.264 290 0.323 295 0.312 300 0.219 305 0.242 310 0.366 315 0.394 320 0.235 325 0.148 330 0.319 335 0.398 340 0.306 345 0.173 350 0.242 355 0.383 360 0.368 365 0.264 370 0.292 375 0.377 380 0.405 385 0.289 390 0.204 395 0.298 400 0.411 405 0.376 410 0.28 415 0.224 420 0.409 425 0.421 430 0.378 435 0.219 440 0.305 445 0.38 450 0.38 455 0.267 460 0.235 465 0.304 470 0.335 475 0.299 480 0.198 485 0.267 490 0.306 495 0.281 500 0.227 [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.