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Jan 27, 2019 11:09 AM
(332 views)

If I have a table with five columns:

Column 5 | Column 3 | Column 2 | Column 1 | Column 4 |

data | data | data | data | data |

and I execute this:

```
dt = Current Data Table();
dt << Move Selected Columns({"Column 1", "Column 2", "Column 3", "Column 4", "Column 5"}, To first)
```

then I get this:

Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |

data | data | data | data | data |

But if I execute this:

```
dt= Current Data Table();
list = {"Column 1", "Column 2", "Column 3", "Column 4", "Column 5"};
dt << Move Selected Columns( list, To first);
```

it fails with an "Unrecognized key word" error.

I need to be able to parameterize the column list, as in the second version. How can I make something like the second version work?

2 ACCEPTED SOLUTIONS

Accepted Solutions

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I tried various flavors of as list(), listeval(), expr, evalexpr(), etc. to no avail. Had to resort to eval(parse()):

```
dt = current data table();
alist = {"Column 4", "Column 3", "Column 2", "Column 1"};
clist = char(alist);
col_expr = evalinsert("dt << move selected columns(^clist^, to first)");
eval(parse(col_expr));
```

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Solution

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This is just an alternate method, and FYI.

You can also do this with expressions. Eval Expr() replaces each Expr() with its value (name expression), and the external Eval() function, executes the command.

```
dt= Current Data Table();
list = {"Column 1", "Column 2", "Column 3", "Column 4", "Column 5"};
Eval( Eval Expr(dt << Move Selected Columns( Expr(list), To first)) );
```

4 REPLIES

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I tried various flavors of as list(), listeval(), expr, evalexpr(), etc. to no avail. Had to resort to eval(parse()):

```
dt = current data table();
alist = {"Column 4", "Column 3", "Column 2", "Column 1"};
clist = char(alist);
col_expr = evalinsert("dt << move selected columns(^clist^, to first)");
eval(parse(col_expr));
```

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Re: Move Selected Columns() with list parameter

Thanks, that works for me!

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Solution

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This is just an alternate method, and FYI.

You can also do this with expressions. Eval Expr() replaces each Expr() with its value (name expression), and the external Eval() function, executes the command.

```
dt= Current Data Table();
list = {"Column 1", "Column 2", "Column 3", "Column 4", "Column 5"};
Eval( Eval Expr(dt << Move Selected Columns( Expr(list), To first)) );
```

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Re: Move Selected Columns() with list parameter

I'm glad to hear a workaround has been found. In the meantime, we reported this issue to development, and JMP 15 (available later this year) has been updated so that the evaluation will happen automatically. Thanks!