Why am I getting error "too many input arguments" when using referenceEllipsoid and oblateSpheroid?

>> a = 3396200;

ecc = 0.108; % Eccentricity

marsEllipsoid = referenceEllipsoid('Name', 'Mars', 'SemimajorAxis', a, 'Eccentricity', ecc)

Error using referenceEllipsoid

Too many input arguments.

>> semimajorAxis = 3396190; % in meters

eccentricity = 0.1083;

E = oblateSpheroid('SemimajorAxis', semimajorAxis, 'Eccentricity', eccentricity)

Error using oblateSpheroid

Too many input arguments.

Answer 1

[Star Strider]

All the values apparently must be assigned as properties of the original objects after creating each, rather than passed as name-value pairs in the argument list. (I don't have the Mapping Toolbox, so I have little experience with it.)

Try something like this --

a = 3396200;
ecc = 0.108; % Eccentricity
marsEllipsoid = referenceEllipsoid('mars')  % Display Original Default Values

marsEllipsoid = 
referenceEllipsoid with defining properties:

                 Code: []
                 Name: 'Mars'
           LengthUnit: 'meter'
        SemimajorAxis: 3396900
        SemiminorAxis: 3376097.80585952
    InverseFlattening: 163.295274386012
         Eccentricity: 0.1105

  and additional properties:

    Flattening
    ThirdFlattening
    MeanRadius
    SurfaceArea
    Volume

marsEllipsoid.SemimajorAxis = a;
marsEllipsoid.Eccentricity = ecc

marsEllipsoid = 
referenceEllipsoid with defining properties:

                 Code: []
                 Name: 'Mars'
           LengthUnit: 'meter'
        SemimajorAxis: 3396200
        SemiminorAxis: 3376335.26613277
    InverseFlattening: 170.966297494803
         Eccentricity: 0.108

  and additional properties:

    Flattening
    ThirdFlattening
    MeanRadius
    SurfaceArea
    Volume

semimajorAxis = 3396190; % in meters
eccentricity = 0.1083;
E = oblateSpheroid                          % Display Original Default Values

E = 
oblateSpheroid with defining properties:

        SemimajorAxis: 1
        SemiminorAxis: 1
    InverseFlattening: Inf
         Eccentricity: 0

  and additional properties:

    Flattening
    ThirdFlattening
    MeanRadius
    SurfaceArea
    Volume

E.SemimajorAxis = semimajorAxis;
E.Eccentricity = eccentricity

E = 
oblateSpheroid with defining properties:

        SemimajorAxis: 3396190
        SemiminorAxis: 3376214.48511856
    InverseFlattening: 170.017645109886
         Eccentricity: 0.1083

  and additional properties:

    Flattening
    ThirdFlattening
    MeanRadius
    SurfaceArea
    Volume

.