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Jun 26, 2017 6:52 AM
(1190 views)

Good day all.

I am having trouble with trying to convert some old SAS 9.1 code, that runs an ** iterative calculation** ("do until"), into JSL (I am running JMP 13).

Attached is the original SAS code as it appears in the JMP window when I open the *.SAS file. I have isolated the pertinent sub-section of the script from the original SAS script and attached it in *jsl format as "mg_in_olivine.jsl".

I have also included a dummy dataset with 29 records and a number of the required parameters have already been calculated (thre rest of the numerous columns have been hidden):

t_niK

PCr

dv

xmg_gt

xfe_gt

xca_gt

I would greatly appreciate any help I can get.

Many thanks.

Rob Preston (Johannesburg).

1 ACCEPTED SOLUTION

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Jun 26, 2017 7:28 AM
(2318 views)

Solution

Might this be what you are looking for?

```
Names Default To Here( 1 );
dt = Current Data Table();
dt << New Column( "xmg_ol_diff" );
For( i = 1, i <= N Rows( dt ), i++,
counter = 0;
While( Abs( dt:xmg_ol_diff[i] ) > 0.00001 | Is Missing( dt:xmg_ol_diff[i] ) == 1,
counter++;
If( counter > 100, Break() );
logKd = (902 + dt:dv[i] + (dt:xmg_ol_est[i] - dt:xfe_ol_est[i]) * (498 + 1.51 * (dt:PCr[i] - 30)) - 98 * (dt:xmg_gt[i] - dt:xfe_gt[i])
+1347 * dt:xca_gt[i]) / dt:t_niK[i] - 0.357;
Kd = Exp( LogKd );
xmgfe_ol = Kd * (dt:xmg_gt[i] / dt:xfe_gt[i]);
xmg_ol = xmgfe_ol / (1 + xmgfe_ol);
dt:xmg_ol_diff[i] = xmg_ol - dt:xmg_ol_est[i];
dt:xmg_ol_est[i] = xmg_ol; /** reset xmg_ol_est for next iteration **/
dt:xfe_ol_est[i] = 1.0 - xmg_ol;
);
);
```

Jim

8 REPLIES

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Jun 26, 2017 7:06 AM
(1186 views)

Look at the **While()** function for this kind of iteration.

- Help > Books > Scripting Guide

Learn it once, use it forever!

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Jun 26, 2017 7:24 AM
(1181 views)

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Jun 26, 2017 7:28 AM
(2319 views)

Might this be what you are looking for?

```
Names Default To Here( 1 );
dt = Current Data Table();
dt << New Column( "xmg_ol_diff" );
For( i = 1, i <= N Rows( dt ), i++,
counter = 0;
While( Abs( dt:xmg_ol_diff[i] ) > 0.00001 | Is Missing( dt:xmg_ol_diff[i] ) == 1,
counter++;
If( counter > 100, Break() );
logKd = (902 + dt:dv[i] + (dt:xmg_ol_est[i] - dt:xfe_ol_est[i]) * (498 + 1.51 * (dt:PCr[i] - 30)) - 98 * (dt:xmg_gt[i] - dt:xfe_gt[i])
+1347 * dt:xca_gt[i]) / dt:t_niK[i] - 0.357;
Kd = Exp( LogKd );
xmgfe_ol = Kd * (dt:xmg_gt[i] / dt:xfe_gt[i]);
xmg_ol = xmgfe_ol / (1 + xmgfe_ol);
dt:xmg_ol_diff[i] = xmg_ol - dt:xmg_ol_est[i];
dt:xmg_ol_est[i] = xmg_ol; /** reset xmg_ol_est for next iteration **/
dt:xfe_ol_est[i] = 1.0 - xmg_ol;
);
);
```

Jim

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Jun 26, 2017 7:41 AM
(1175 views)

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Jun 26, 2017 8:21 AM
(1162 views)

The the end of the script, the final output value should be xmg_ol as ii is the input value for next section of code (as follows):

/** now apply Gaul et al correction for cr2o3 - see p. 225 **/

/** note that in Gaul et al Delta-Fo is in percent **/

/** make sure cr2o3 > 0 otherwise we get log ERROR **/

if cr2o3 <=0 then

cr_corr = 0;

else

cr_corr = (-1.2901*log10(cr2o3) + 0.69)/100.0;

xmg_ol_corr = xmg_ol + cr_corr;

xmg_ol = xmg_ol_corr;

fo_oliv = xmg_ol*100.0;

I am a bit clueless (to say the least)...but I appreciate your help.

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Jun 26, 2017 9:21 AM
(1159 views)

1. I encourage you to heed Mark's suggestion about reading the Scripting Guide. What you are asking for in your latest request is just learning what an "IF" statement looks like in JMP. Converting syntax from language to language is typically just figuring out some minor language issues.

2. You can also use the Scripting Index

Help==>Scripting Index

to see not only documentation on the "IF" statement, but also an example

Here is the example from the Scripting Index for the IF function. It will translate directly to you latest request.

```
Names Default To Here( 1 );
If( Random Uniform() < 0.5,
"heads",
"tails"
);
```

Jim

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Jun 26, 2017 11:13 PM
(1149 views)

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Jun 27, 2017 12:27 AM
(1147 views)

Thanks again for your help, I'm getting there albeit slowly.

:)