atomsIsInstalled Determines whether the module is installed. Returns true if the module is installed, false otherwise.

## Syntax

                res = atomsIsInstalled(modules)
                res = atomsIsInstalled(modules, section)

## Arguments

modules

  mx1, mx2 Matrix of strings:

  1st Col. | Technical name | Mandatory |
  2nd Col. | Version | Optional | If this field is empty or is not present, module's version is ignored.
  3rd Col. | Section | Optional | If this field is empty or is not present, module's section is ignored.

section

  This argument controls the list of searched modules.

  `section` is a single-string and its value should be :

  - `"all"`: atomsIsInstalled() searches external modules installed in both "user" and "allusers" sections.

  - `"allusers"`: atomsIsInstalled() searches external modules installed in the "allusers" section.

  - `"user"`: atomsIsInstalled() searches external modules installed in the "user" section.

  The default value is "all".

res

## Description

## Examples

    atomsSetConfig("Verbose","True");
    atomsRepositoryAdd("http://scene1.test.atoms.scilab.org");

    // Install the needed module for the purpose of the example
    atomsInstall("toolbox_5","user");

    // simplest way
    atomsIsInstalled("toolbox_5");

    // Check several modules ...
    atomsIsInstalled(["toolbox_5" "toolbox_4"])

    // ... with a specific version
    atomsIsInstalled(["toolbox_5" "1.0" ; "toolbox_4" "1.0" ; "toolbox_5" "1.1"])

    // ... installed in a specific section
    atomsIsInstalled(["toolbox_5" "1.0" ; "toolbox_4" "1.0" ; "toolbox_5" "1.1"],"user")
    atomsIsInstalled(["toolbox_5" "1.0" ; "toolbox_4" "1.0" ; "toolbox_5" "1.1"],"allusers")

    // Some cleaning ...
    atomsRepositoryDel("http://scene2.test.atoms.scilab.org");
    atomsRemove("toolbox_2");

## See also

- atomsInstall
- atomsGetInstalled