擅长:python、mysql、java
<p>从<code>?nls</code>可以看出:<code>nsl</code>中的第一个参数是<code>formula</code>:</p>
<blockquote>
<p>formula: a nonlinear model formula including variables and parameters.
Will be coerced to a formula if necessary</p>
</blockquote>
<p>现在,如果你做<code>?formula</code>,我们可以读到:</p>
<blockquote>
<p>The models fit by, e.g., the lm and glm functions are specified in a
compact symbolic form. The ~ operator is basic in the formation of
such models. An expression of the form y ~ model is interpreted as a
specification that the response y is modelled by a linear predictor
specified symbolically by model</p>
</blockquote>
<p>因此,在你的例子中<code>~</code><code>nls</code>将左边的响应/相依/回归变量与非线性最小二乘法右边的回归/解释变量连接起来。你知道吗</p>
<p>最好的!你知道吗</p>