# A question about OSR command and policy frontier
**URL:** https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959
**Category:** Optimal Policy
**Created:** [2 January 2017 16:37 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959 "2017-01-02T16:37:50Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@zhanshuo](https://forum.dynare.org/u/zhanshuo)
#### Post date: [2 January 2017 16:37 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959/1 "2017-01-02T16:37:50Z")
Dear all,
I am now using OSR to calculate the simple optimal rule and plot the policy frontier.
But I find that all the papers on the topic of policy frontier have given a limitation on variance of the key variable,e.g., in Iacoviello(2005), "I constrain interest rate volatility by imposing an upper bound 25 percent larger than the estimated standard deviation…"
So how should I put a variance constraint in OSR?
Thanks.
---
### Author:  [@zhanshuo](https://forum.dynare.org/u/zhanshuo)
#### Post date: [7 January 2017 13:53 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959/2 "2017-01-07T13:53:17Z")
Anyone knows that?
Great thanks.
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### Author:  [@jpfeifer](https://forum.dynare.org/u/jpfeifer)
#### Post date: [8 January 2017 19:08 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959/3 "2017-01-08T19:08:21Z")
That is not easy to impose. Dynare allows you to impose bounds on the parameters, not on the endogenous objects. In the exampe posted at [[Policy frontier](http://forum.dynare.org/t/policy-frontier/5910/1)) you would probably need to check whether
```auto
var_y(grid_iter)
```
is above a particular value and then set the output to NaN.
---
### Author:  [@zhanshuo](https://forum.dynare.org/u/zhanshuo)
#### Post date: [9 January 2017 07:34 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959/4 "2017-01-09T07:34:57Z")
Thanks, I will try.
And could you tell me how to impose constraint on the value of the parameters?
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### Author:  [@jpfeifer](https://forum.dynare.org/u/jpfeifer)
#### Post date: [9 January 2017 09:22 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959/5 "2017-01-09T09:22:51Z")
See the manual of the unstable version/4.5 on `osr_params_bounds`
---
### Author:  [@zhanshuo](https://forum.dynare.org/u/zhanshuo)
#### Post date: [10 January 2017 06:43 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959/6 "2017-01-10T06:43:03Z")
Thanks a lot!
So is there a guide for how to setup dynare 4.5?
and can it co-exist with 4.4.3?
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### Author:  [@jpfeifer](https://forum.dynare.org/u/jpfeifer)
#### Post date: [10 January 2017 19:57 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959/7 "2017-01-10T19:57:00Z")
The unstable version is available at [dynare.org/download/dynare-unstable/](http://www.dynare.org/download/dynare-unstable/)
You can select the Dynare version you want to use by providing Matlab with the path to the Matlab subfolder of the respective Dynare version.
---
### Author:  [@zhanshuo](https://forum.dynare.org/u/zhanshuo)
#### Post date: [15 January 2017 14:40 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959/8 "2017-01-15T14:40:09Z")
Thanks a lot .
So if I simultaneously add both 4.43 and 4.5 unstable into the matlab path, which version will matlab choose to run ?
And how could I choose to run one of these two versions if I wanna to manually, if both of them are in my matlab path?
---
### Author:  [@jpfeifer](https://forum.dynare.org/u/jpfeifer)
#### Post date: [17 January 2017 10:53 UTC](https://forum.dynare.org/t/a-question-about-osr-command-and-policy-frontier/5959/9 "2017-01-17T10:53:31Z")
Always only add the one you want to your path. For example, when you use 4.4.3, use something like
```auto
addpath('C:\dynare\4.4.3\matlab')
```
in Matlab to select 4.4.3 (of course with your path)