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sheshou123

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[求助] MATLAB 指数函数拟合已有1人参与

x=(1:1:300);
y=(35.4892 49.136 63.0808 76.7291 89.9925 102.868 115.365 127.494 139.267 150.693 161.783 172.547 182.994 193.134 202.975 212.527 221.798 230.797 239.53 248.007 256.234 264.219 271.969 279.492 286.793 293.879 300.756 307.432 313.911 320.199 326.303 332.226 337.976 343.556 348.973 354.23 359.332 364.284 369.09 373.755 378.283 382.678 386.943 391.083 395.101 399.001 402.786 406.46 410.026 413.486 416.845 420.105 423.27 426.341 429.322 432.215 435.023 437.748 440.393 442.961 445.453 447.871 450.219 452.497 454.708 456.855 458.938 460.96 462.922 464.827 466.675 468.469 470.211 471.901 473.542 475.134 476.679 478.179 479.635 481.048 482.419 483.75 485.042 486.296 487.513 488.694 489.841 490.953 492.033 493.082 494.099 495.086 496.045 496.975 497.878 498.754 499.605 500.43 501.231 502.009 502.764 503.496 504.207 504.897 505.567 506.217 506.848 507.46 508.055 508.632 509.191 509.735 510.262 510.774 511.271 511.753 512.221 512.676 513.117 513.545 513.96 514.363 514.754 515.134 515.503 515.861 516.208 516.545 516.872 517.189 517.498 517.797 518.087 518.369 518.642 518.908 519.165 519.415 519.658 519.893 520.122 520.344 520.559 520.768 520.971 521.168 521.359 521.544 521.725 521.899 522.069 522.233 522.393 522.548 522.699 522.845 522.987 523.124 523.258 523.387 523.513 523.635 523.754 523.869 523.98 524.089 524.194 524.296 524.395 524.491 524.585 524.675 524.763 524.848 524.931 525.012 525.09 525.165 525.239 525.31 525.379 525.447 525.512 525.575 525.637 525.696 525.754 525.81 525.865 525.918 525.969 526.019 526.067 526.114 526.16 526.204 526.247 526.289 526.329 526.369 526.407 526.444 526.479 526.514 526.548 526.581 526.613 526.644 526.674 526.703 526.731 526.759 526.785 526.811 526.836 526.86 526.884 526.907 526.929 526.951 526.972 526.992 527.012 527.031 527.05 527.068 527.085 527.102 527.119 527.135 527.15 527.166 527.18 527.194 527.208 527.222 527.235 527.247 527.26 527.271 527.283 527.294 527.305 527.316 527.326 527.336 527.345 527.355 527.364 527.373 527.381 527.39 527.398 527.405 527.413 527.42 527.428 527.435 527.441 527.448 527.454 527.46 527.466 527.472 527.478 527.483 527.489 527.494 527.499 527.504 527.508 527.513 527.517 527.522 527.526 527.53 527.534 527.538 527.541 527.545 527.548 527.552 527.555 527.558 527.561 527.564 527.567 527.57 527.573 527.576 527.578 527.581 527.583 527.586 527.588 527.59 527.592 527.594 527.596 527.598);
利用cftool，怎么拟合不了，感谢大神。或许用其他拟合方法：y=a-b*exp(c*x)（麻烦提供源程序，一共有八组数据），非常感谢

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