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Feb 22, 2017 7:15 AM
(4083 views)

Hi everybody,

I have this type of data table (see attached file). I want to detect all values which are outside of 2 threshold values (-0.5 and 0.5) and replace them by the ceiling values. For example: -5.30, -6.00, -11.56 must be replaced by the same value of -5.00, and 5.30, 6.00, and 11.56 replaced by 5.00.

Have you any suggestion to do that in a simple way ?

Thanking you in advance

1 ACCEPTED SOLUTION

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If you think about doing this with JSL there are several ways.

For example, you could simply loop over the columns and conditionally replace cells

```
dt = Data Table("test.jmp");
For(i = 8, i <= N Col(dt), i++,
ur = dt << get rows where(Column(dt, i)[] > 0.5);
lr = dt << get rows where(Column(dt, i)[] < -0.5);
Column(dt, i)[ur] = 5;
Column(dt, i)[lr] = -5;
);
```

An alternative (JMP 13) is to work with data tables as matrices using subscripts. The syntax also supports assignment, i.e. replacement of cell values. Here's an example:

```
dt = Data Table("test.jmp");
t = 0.5; // Treshold value
c = 5; // Ceiling value
nr = N Row(dt);
nc = N Col(dt);
M = dt[1 :: nr, 8 :: nc];// Matrix with all cells from col 8 to end of table
U = M <= t; // Below upper limit?
L = M >= -t; // Above lower limit?
//Assign treshold values to data table
dt[1 :: nr, 8 :: nc] = M :* (U & L) + c * (!U - !L);
```

2 REPLIES 2

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If you think about doing this with JSL there are several ways.

For example, you could simply loop over the columns and conditionally replace cells

```
dt = Data Table("test.jmp");
For(i = 8, i <= N Col(dt), i++,
ur = dt << get rows where(Column(dt, i)[] > 0.5);
lr = dt << get rows where(Column(dt, i)[] < -0.5);
Column(dt, i)[ur] = 5;
Column(dt, i)[lr] = -5;
);
```

An alternative (JMP 13) is to work with data tables as matrices using subscripts. The syntax also supports assignment, i.e. replacement of cell values. Here's an example:

```
dt = Data Table("test.jmp");
t = 0.5; // Treshold value
c = 5; // Ceiling value
nr = N Row(dt);
nc = N Col(dt);
M = dt[1 :: nr, 8 :: nc];// Matrix with all cells from col 8 to end of table
U = M <= t; // Below upper limit?
L = M >= -t; // Above lower limit?
//Assign treshold values to data table
dt[1 :: nr, 8 :: nc] = M :* (U & L) + c * (!U - !L);
```

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Re: locate value and replace them

Thank you very much MS,

Your first option works very well !

PA