https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/quot-Find-and-Replace-quot-in-IML/m-p/238008#M2506 <P>The<A href="http://blogs.sas.com/content/iml/2011/05/16/finding-data-that-satisfy-a-criterion.html" target="_self"> LOC function will find the location </A>of the elements that you are looking for. Then you can use regular assignment to replace the numbers.&nbsp; For example, to replace all values -99 with a missing value, do the following:</P> <P>&nbsp;</P> <P>&nbsp;</P> <PRE><CODE class=" language-sas">proc iml; x = {1 -99 3 4, 5 6 -99 8}; idx = loc(x = -99); /* find location of elements */ x[idx] = .; /* replace those elements */ </CODE></PRE> Sun, 06 Dec 2015 11:52:12 GMT Rick_SAS 2015-12-06T11:52:12Z https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/quot-Find-and-Replace-quot-in-IML/m-p/238005#M2505 <P>In IML, is there any way to find every occurrence of a certain number in a matrix and replace it with another number, and what is the syntax for this?</P> Sun, 06 Dec 2015 10:59:05 GMT https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/quot-Find-and-Replace-quot-in-IML/m-p/238005#M2505 dvtarasov 2015-12-06T10:59:05Z https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/quot-Find-and-Replace-quot-in-IML/m-p/238008#M2506 <P>The<A href="http://blogs.sas.com/content/iml/2011/05/16/finding-data-that-satisfy-a-criterion.html" target="_self"> LOC function will find the location </A>of the elements that you are looking for. Then you can use regular assignment to replace the numbers.&nbsp; For example, to replace all values -99 with a missing value, do the following:</P> <P>&nbsp;</P> <P>&nbsp;</P> <PRE><CODE class=" language-sas">proc iml; x = {1 -99 3 4, 5 6 -99 8}; idx = loc(x = -99); /* find location of elements */ x[idx] = .; /* replace those elements */ </CODE></PRE> Sun, 06 Dec 2015 11:52:12 GMT https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/quot-Find-and-Replace-quot-in-IML/m-p/238008#M2506 Rick_SAS 2015-12-06T11:52:12Z