randomAffine3d() claim to take function handle for shear, but parser fails it

According to the doc of randomAffine3d:

Shear — Range of shear

[0 0] (default) | 2-element numeric vector | function handle

...

A function handle. The function must accept no input arguments and return the shear angle as a numeric scalar. Use a function handle to pick a shear angle from a disjoint interval or using a nonuniform probability distribution.

When using this function e.g.

function A = selectShear1
A = -(rand(1,1)*5+5);
end

the validator (below) returns with this error message:

'The value of 'Shear' is invalid. Expected Shear to be one of these types:

double, single, uint8, uint16, uint32, uint64, int8, int16, int32, int64

Instead its type was function_handle.'

which seems to be alright given:

function TF = validateShear(val)
iValidateNumericRange('Shear',val,'<',90,'>',-90);
TF = true;
end

That it after all doesn't take function handles...

[Steven Lord]

Can you show us the code you've written to call randomAffine3d using this function handle?

Answer 1

[Mads]

for ro = [0,-1,1]
    if ro == -1
        Rot = @selectRotation1;
    elseif ro == 0
        Rot = [0,0];
    elseif ro == 1
        Rot = @selectRotation2;
    end
    for sh = [0,-1,1]
        if sh == -1
            She = [-10,-5];%%@selectShear1;
        elseif sh == 0
            She = [0,0];
        elseif sh == 1
            She = [5,10];%@selectShear2;
        end
        for sc = [0,-1,1]
            if sc == -1
                Sca = @selectScale1;
            elseif sc == 0
                Sca = [1,1];
            elseif sc == 1
                Sca = @selectScale2;
            end
            for tl = [0,-1,1]
                if tl == -1
                    Trax = -[Tr2,Tr1];
                    Tray = -[Tr2,Tr1];
                    Traz = -[Tr2,Tr1];
                elseif tl == 0
                    Trax = [0,0];
                    Tray = [0,0];
                    Traz = [0,0];
                elseif tl == 1
                    Trax = [Tr1,Tr2];
                    Tray = [Tr1,Tr2];
                    Traz = [Tr1,Tr2];
                end
                for zr = 0:1
                    
                    tform = randomAffine3d(Rotation=Rot,Shear=She,Scale=Sca,XTranslation=Trax,YTranslation=Tray,ZTranslation=Traz);
                end
            end
        end
    end
end

function [rotationAxis,theta] = selectRotation1
theta = rand(1,1) * 10+5;
rotationAxis = [1,0,0]';
theta1 = rand(1,1) * 10;
theta2 = rand(1,1) * 10;
% Rz = [cosd(theta2),-sind(theta2),0;sind(theta2),cosd(theta2),0;0,0,1];
Rx = [1,0,0;0,cosd(theta2),-sind(theta2);0,sind(theta2),cosd(theta2)];
Ry = [cosd(theta1),0,sind(theta1);0,1,0;-sind(theta1),0,cosd(theta1)];
rotationAxis = Rx*Ry*rotationAxis;
rotationAxis = rotationAxis(:)';
end
function [rotationAxis,theta] = selectRotation2
theta = rand(1,1) * 10+5;
theta = -theta;
rotationAxis = [1,0,0]';
theta1 = rand(1,1) * 10;
theta2 = rand(1,1) * 10;
% Rz = [cosd(theta2),-sind(theta2),0;sind(theta2),cosd(theta2),0;0,0,1];
Rx = [1,0,0;0,cosd(theta2),-sind(theta2);0,sind(theta2),cosd(theta2)];
Ry = [cosd(theta1),0,sind(theta1);0,1,0;-sind(theta1),0,cosd(theta1)];
rotationAxis = Rx*Ry*rotationAxis;
rotationAxis = rotationAxis(:)';
end
function A = selectShear1
A = -(rand(1,1)*5+5);
end
function A = selectShear2
A = (rand(1,1)*5+5);
end
function A = selectScale1
A = rand(1,1)*(0.09)+0.9;
end
function A = selectScale2
A = rand(1,1)*(0.09)+1.01;
end

[Mads]

well, the above without comments before the shear function handles