当我尝试连接R与Access数据库时,我收到一个错误
odbcConnectAccess is only usable with 32-bit Windows
有谁知道如何解决这个问题？
library(RODBC)
mdbConnect<-odbcConnectAccess("D:/SampleDB1/sampleDB1.mdb")
我是网络开发的新手。我刚刚开始用php编程。我想开发一个动态页面，该页面连接到MySQL数据库（从服务器），并在绘图中实时显示结果（可能是散点图，直方图）。到目前为止，我设法从数据库中获取数据并显示图形。但是，我无法实时进行。
我一直在搜索。我发现使用AJAX进行实时绘图。很好，我对此做了一些教程，并能够运行示例。我的挑战是绘制图形。
如果有帮助，这正是我想要做的 http://jsxgraph.uni-bayreuth.de/wiki/index.php/Real-time_graphing
我尝试运行此代码，但无法执行。
谁能告诉我如何从简单开始？如果我的问题不够清楚，我会详细说明。先感谢您！
@Tim，这是我尝试做的。
我的PHP是
<?php
$con = mysql_connect("localhost","root","");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
else
//echo "Database Connected!";
mysql_select_db("DB", $con);
$sql=mysql_query("SELECT Def_ID, Def_BH FROM BBB WHERE Ln_Def < 1200");
$Def_ID= array();
$Def_BH = array();
while($rs = mysql_fetch_array($sql))
{
$Def_ID[] = $rs['Def_ID'];
$Def_BH [] = $rs['Def_BH '];
}
mysql_close($con);
$json = array(
'Def_ID' => $Def_ID,
'Def_BH' => $Def_BH
);
echo json_encode($json);
?>
输出是
{"Df_ID":["0","1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31","32","33","34","35","36","37","38","39","40","41"],"Df_BH":["1","1","1","5","5","2","1","1","1","1","2","1","1","1","1","1","1","1","1","1","1","1","2","1","1","2","1","3","10","1","2","1","1","1","2","2","2","1","1","1","1","1"]}
然后我的脚本如下
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html> …我有两个集合A和B.我想检查集合A是否是集合B的子集.我试过我知道R中的集合操作.我尝试了交叉,union,setdiff.但是,没有他们是有帮助的.例如,
A = c(1, 2, 3, 4)
B = c(1, 2, 3, 4, 5)
我正在寻找一个返回TRUE或FALSE的函数.我已经使用A %in% B并比较了总和和长度,它完成了同样的工作.但我觉得有一种更好的做法.
length(A %in% B) == sum(A %in% B)返回TRUE并
length(B %in% A) == sum(B %in% A)返回FALSE.
我有一个数据框x和y,我知道y的最大值.我想将这些数据拟合到二次模型中.我怎么能在R知道最大值？如果我不知道最大值,我会用lm(y~x + I(x ^ 2))拟合.任何人都可以对此有所了解吗？提前致谢!
我想知道当前时间是否是五的倍数。这意味着，我想检查它是否是 8:30、8:35、8:40，...javascript 或 php 中是否有任何函数可以执行此操作？
目前我在R中进行数据分析.最终我想创建一个GUI,可以给出分析摘要和主要情节.有谁知道我是否可以使用R来创建界面？如果没有,你知道我是否可以结合MATLAB(用于GUI)和R？
我感谢你的合作.
先感谢您!