muscle.html

来自「本程序是基于linux系统下c++代码」· HTML 代码 · 共 102 行

HTML
102 行
字号 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><title>R: Effect of Calcium Chloride on Muscle Contraction in Rat Hearts</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet" type="text/css" href="../../R.css">
</head><body>

<table width="100%" summary="page for muscle {MASS}"><tr><td>muscle {MASS}</td><td align="right">R Documentation</td></tr></table>
<h2>Effect of Calcium Chloride on Muscle Contraction in Rat Hearts</h2>


<h3>Description</h3>

<p>
The purpose of this experiment was to assess the influence of
calcium in solution on the contraction of heart muscle in rats.
The left auricle of 21 rat hearts was isolated and on several
occasions a constant-length strip of tissue was electrically
stimulated and dipped into various concentrations of calcium
chloride solution, after which the shortening of the strip was
accurately measured as the response.
</p>


<h3>Usage</h3>

<pre>
muscle
</pre>


<h3>Format</h3>

<p>
This data frame contains the following columns:
<dl>
<dt><code>Strip</code></dt><dd>which heart muscle strip was used?
</dd>
<dt><code>Conc</code></dt><dd>concentration of calcium chloride solution, in multiples of 2.2 mM.
</dd>
<dt><code>Length</code></dt><dd>the change in length (shortening) of the strip, (allegedly) in mm.
</dd></dl>

<h3>Source</h3>

<p>
Linder, A., Chakravarti, I. M. and Vuagnat, P. (1964)
Fitting asymptotic regression curves with different asymptotes.
In
<EM>Contributions to Statistics. Presented to Professor P. C. Mahalanobis </EM>
<EM>on the occasion of his 70th birthday,</EM>
ed. C. R. Rao, pp. 221&ndash;228. Oxford: Pergamon Press.
</p>


<h3>References</h3>

<p>
Venables, W. N. and Ripley, B. D. (2002)
<EM>Modern Applied Statistics with S.</EM> Fourth Edition. Springer.
</p>


<h3>Examples</h3>

<pre>
A &lt;- model.matrix(~ Strip - 1, data=muscle)
rats.nls1 &lt;- nls(log(Length) ~ cbind(A, rho^Conc),
   data = muscle, start = c(rho=0.1), algorithm="plinear")
B &lt;- coef(rats.nls1)
B

st &lt;- list(alpha = B[2:22], beta = B[23], rho = B[1])
(rats.nls2 &lt;- nls(log(Length) ~ alpha[Strip] + beta*rho^Conc,
                  data = muscle, start = st))

attach(muscle)
Muscle &lt;- expand.grid(Conc = sort(unique(Conc)),
                     Strip = levels(Strip))
Muscle$Yhat &lt;- predict(rats.nls2, Muscle)
Muscle &lt;- cbind(Muscle, logLength = rep(as.numeric(NA), 126))
ind &lt;- match(paste(Strip, Conc),
            paste(Muscle$Strip, Muscle$Conc))
Muscle$logLength[ind] &lt;- log(Length)
detach()

require(lattice)
xyplot(Yhat ~ Conc | Strip, Muscle, as.table = TRUE,
   ylim = range(c(Muscle$Yhat, Muscle$logLength), na.rm = TRUE),
   subscripts = TRUE, xlab = "Calcium Chloride concentration (mM)",
   ylab = "log(Length in mm)", panel =
   function(x, y, subscripts, ...) {
      lines(spline(x, y))
      panel.xyplot(x, Muscle$logLength[subscripts], ...)
   })
</pre>



<hr><div align="center">[Package <em>MASS</em> version 7.2-44 <a href="00Index.html">Index]</a></div>

</body></html>

muscle.html - 源码说明

本页面展示了「本程序是基于linux系统下c++代码」中的 muscle.html 源码文件，采用 HTML 编程语言编写，共 102 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。

虫虫开发者社区收录了大量与Linux相关的技术资源，包括源代码、技术文档、电路图等，是电子工程师和嵌入式开发者的专业学习平台。

⌨️ 快捷键说明

复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?