Question

我正在尝试用适当的分数替换美式字母等级。例如，A变为4.0，A-变为3.7，B +变为3.3，等等。

我似乎无法使用sub来正确获取正则表达式来进行更改。我无法识别它，例如B，B +和B-都是独立的东西，可能是因为我无法让它使正则表达式正确。

Answer 1

如何创建查找表？

假设您没有多少成绩，您可以创建自己的查找表，如

$purchaseorderinventory=mysqli_query($link,"select * from purchaseorder where ITEM_CODE_MX='".$value."' and SHIP_TO_MX='".$display_branchcode."' and STATUS_PO_MX='RECEIVED'");
    while($row3=mysqli_fetch_array($purchaseorderinventory))
                                    {
                                  $imeipo[]=$row3["IMEI_MX"];


            }
                        $implodepo = implode(",",$imeipo);
                        $explodepo = explode(',', $implodepo);

    $beginventory=mysqli_query($link,"select * from inventory where ITEM_CODE_MX='".$value."' and BRANCH_CODE_MX='".$display_branchcode."'");
    while($row=mysqli_fetch_array($beginventory))
                                    {

                                    $cid=$row["ID_INVENTORY"];
                                     $itemcode=$row["ITEM_CODE_MX"];
                                     $itemquantity=$row["ITEM_QUANTITY_MX"];
                                     $imei=$row["IMEI_MX"];
                                     $site=$row["SITE_CODE_MX"];
                                    $begexplode = explode(',', $imei);


                                    }
    $transfer=mysqli_query($link,"select * from transferinventory where ITEM_CODE_MX='".$value."' and SITE_FROM_MX='".$display_branchcode."'");
    while($row2=mysqli_fetch_array($transfer))
                                    {


         $imeitransfer[]=$row2["IMEI_MX"];


                        }

                        $implodeimeitransfer = implode(",",$imeitransfer);
                        $transferexplode = explode(',', $implodeimeitransfer);
                        //diffrence
        $inventorydiff = array_diff($transferexplode,$explodepo,$begexplode);

                        $finalimplode = implode(",",$inventorydiff);

创建一些样本数据

lookup <- read.table(text = "Grade GradePoint
                                A  4.0
                                A- 3.7
                                B+ 3.3
                                B  3.0
                                B- 2.7", header = T)

现在您可以使用grades <- read.table(text = "Grade A B+ B-", header = T)用积分替换成绩。

merge

您也可以使用效果相同的merge(lookup, grades, by = "Grade")[2] # GradePoint #1 4.0 #2 2.7 #3 3.3

match

替换R中包含特殊字符的字符

1 个答案: