how do I change the position where a gabor patch is displayed (Psychtoolbox)?

I was trying to add x and y coordinates to a gabor patch I generated but I can't figure out where to add this argument in a way where it will actually change the position rather than just presenting the gabor centrally.

% Clear the workspace and the screen
sca;

Unrecognized function or variable 'sca'.

close all;
clear;

% Setup PTB with some default values
PsychDefaultSetup(2);

% Set the screen number to the external secondary monitor if there is one
% connected
screenNumber = max(Screen('Screens'));

% Define black, white and grey
white = WhiteIndex(screenNumber);
grey = white / 2;

% Open the screen
[window, windowRect] = PsychImaging('OpenWindow', screenNumber, grey,...
    [], 32, 2, [], [], kPsychNeedRetinaResolution);

% Get the vertical refresh rate of the monitor
ifi = Screen('GetFlipInterval', window);

% Set maximum priority level
topPriorityLevel = MaxPriority(window);
Priority(topPriorityLevel);


%--------------------
% Gabor information
%--------------------

% Dimension of the region where will draw the Gabor in pixels
gaborDimPix = windowRect(4) / 10;

% Sigma of Gaussian
sigma = gaborDimPix / 8;

% Obvious Parameters
orientation = 0;
contrast = 10;
aspectRatio = 600.0;
phase = 1;
x=60;
y=20;

% Spatial Frequency (Cycles Per Pixel)
% One Cycle = Grey-Black-Grey-White-Grey i.e. One Black and One White Lobe
numCycles = 12;
freq = .12;

% Build a procedural gabor texture (Note: to get a "standard" Gabor patch
% we set a grey background offset, disable normalisation, and set a
% pre-contrast multiplier of 0.5).
backgroundOffset = [0.5 0.5 0.5 0.5];
disableNorm = 1;
preContrastMultiplier = 0.5;
gabortex = CreateProceduralGabor(window, gaborDimPix, gaborDimPix, [],...
    backgroundOffset, disableNorm, preContrastMultiplier);

% Randomise the phase of the Gabors and make a properties matrix.
propertiesMat = [phase, freq, sigma, contrast, aspectRatio, x, y, 0];


%------------------------------------------
%    Draw stuff
%------------------------------------------

% FLip to the vertical retrace rate
vbl = Screen('Flip', window);

% We will update the stimulus on each frame
waitframes = 1;

% We choose an arbitary value at which our Gabor will drift
phasePerFrame = 4 * pi;

while ~KbCheck

    % Draw the Gabor. By default PTB will draw this in the center of the screen
    % for us.
    Screen('DrawTextures', window, gabortex, [], [], orientation, [], 1, 100, [],...
        kPsychDontDoRotation, propertiesMat');

    % Flip to the screen
    vbl = Screen('Flip', window, vbl + (waitframes - 0.5 ) * ifi);

    % Update the phase element of the properties matrix (we could if we
    % want update any or all of the properties on each frame. Here the
    % Gabor will drift to the left.
    propertiesMat(1) = propertiesMat(1) + phasePerFrame;

end

% Clear screen
sca;

Answer 1

[Voss]

According to the documentation:

http://psychtoolbox.org/docs/Screen-DrawTextures

you can specify the location(s) to draw to as the fifth input argument to Screen, destinationRect(s). destinationRect(s) should be a 4-by-n matrix, for drawing to n locations.