assert_checktrue Check that condition is true.

## Syntax

                flag = assert_checktrue ( condition )
                flag = assert_checktrue ( condition )
                [flag,errmsg] = assert_checktrue ( condition )

## Parameters

condition:

  a matrix of booleans

flag :

  a 1-by-1 matrix of boolean, %t if condition is true, %f if not

errmsg :

  a 1-by-1 matrix of strings, the error message. If flag==%t, then errormsg=="". If flag==%f, then errmsg contains the error message.

## Description

Performs silently if all entries in `condition` are true.

Generates an error if any entry in the `condition` matrix is false. Generates an error if `condition` is not a boolean.

If any entry in condition is false,

- if the errmsg output variable is not used, an error is generated,

- if the errmsg output variable is used, no error is generated.

## Examples

    // Tests which pass
    assert_checktrue ( %t );
    flag = assert_checktrue ( %t )
    [flag,errmsg] = assert_checktrue ( %t )
    [flag,errmsg] = assert_checktrue ( [%t %t] );

    // Tests which fail
    assert_checktrue ( [%t %f] );
    flag = assert_checktrue ( [%t %f] )
    // No error generated
    [flag,errmsg] = assert_checktrue ( [%t %f] )

    // Wrong calls
    assert_checktrue ( "a" )

## History

5.4.0 Function introduced