只执行代码的一部分，不显示任何错误消息

我在Mac OS上使用MATLAB 2020 Psychtoolbox，每次运行此代码时，屏幕都会变灰，然后会发出错误声音，但命令窗口中不会显示错误消息。如何执行所有代码？

% Clear the workspace
close all;
clearvars;
sca;
% Setup PTB with some default values
PsychDefaultSetup(2);
% Seed the random number generator. Here we use the an older way to be
% compatible with older systems. Newer syntax would be rng('shuffle'). Look
% at the help function of rand "help rand" for more information
rand('seed', sum(100 * clock));
% Set the screen number to the external secondary monitor if there is one
% connected
screenNumber = max(Screen('Screens'));
% Define white, grey and black
white = WhiteIndex(screenNumber);
grey = white / 2;
black = BlackIndex(screenNumber);
% Open an on screen window
[window, windowRect] = PsychImaging('OpenWindow', screenNumber, grey);
% Get the size of the on screen window
[screenXpixels, screenYpixels] = Screen('WindowSize', window);
% Query the frame duration
ifi = Screen('GetFlipInterval', window);
% Set up alpha-blending for smooth (anti-aliased) lines
Screen('BlendFunction', window, 'GL_SRC_ALPHA', 'GL_ONE_MINUS_SRC_ALPHA');
% Setup the text type for the window
Screen('TextFont', window, 'Ariel');
Screen('TextSize', window, 36);
% Get the centre coordinate of the window
[xCenter, yCenter] = RectCenter(windowRect);

%----------------------------------------------------------------------
%                       Keyboard information
%----------------------------------------------------------------------
% Define the keyboard keys that are listened for. We will be using the left
% and right arrow keys as response keys for the task and the escape key as
% a exit/reset key
escapeKey = KbName('ESCAPE');
leftKey = KbName('LeftArrow');
rightKey = KbName('RightArrow');
downKey = KbName('DownArrow');
%----------------------------------------------------------------------
%                       Fixation cross
%----------------------------------------------------------------------
% Here we set the size of the arms of our fixation cross
fixCrossDimPix = 10;
% Now we set the coordinates (these are all relative to zero we will let
% the drawing routine center the cross in the center of our monitor for us)
xCoords = [-fixCrossDimPix fixCrossDimPix 0 0];
yCoords = [0 0 -fixCrossDimPix fixCrossDimPix];
allCoords = [xCoords; yCoords];
% Set the line width for our fixation cross
lineWidthPix = 4;
%----------------------------------------------------------------------
%                            Colors
%----------------------------------------------------------------------
% We are going to use three colors for this demo. Red, Green and blue.
wordList = {'Green', 'Magenta', 'Orange'};
Colors = [0 1 0; 1 0 1; 0.8500 0.3250 0.0980];
%----------------------------------------------------------------------
%                  Define positions of sequences
%----------------------------------------------------------------------
leftX = screenXpixels/2.5;
leftY = screenXpixels/1.6;
rightX = screenXpixels/1.7;
rightY = screenYpixels/1.6;
upX = screenXpixels/2.1;
upY = screenYpixels/2.6;
left = [leftX leftY];
right = [rightX rightY];
up = [upX upY];
%----------------------------------------------------------------------
%                  Randomise temporal order of trials
%----------------------------------------------------------------------

trialorder = [1 0 0 0 0];
randtemp = shuffle(trialorder);
%----------------------------------------------------------------------
%                           Trial loop
%----------------------------------------------------------------------
nTrials = 5;
for trial = 1:randtemp

% randomise position of sequences
randpos = shuffle(left, right, up);

% fixation cross
% Draw the fixation cross in white, set it to the center of our screen and
% set good quality antialiasing
Screen('DrawLines', window, allCoords,...
lineWidthPix, white, [xCenter yCenter], 2);
% Derive distributions
seq1 = distribution(0.02, 0.126, 0.146, 0.106, 5); % high variance
seq2 = distribution(0.02, 0.126, 0.146, 0.106, 5); % low variance
seq3 = distribution(0.02, 0.126, 0.146, 0.106, 5); % low variance

seq4 = distribution(0.02, 0.126, 0.146, 0.106, 5);
seq5 = distribution(0.02, 0.126, 0.146, 0.106, 5);
seq6 = distribution(0.02, 0.126, 0.146, 0.106, 5);

seq7 = distribution(0.02, 0.126, 0.146, 0.106, 5);
seq8 = distribution(0.02, 0.126, 0.146, 0.106, 5);
seq9 = distribution(0.02, 0.126, 0.146, 0.106, 5);

seq10 = distribution(0.02, 0.126, 0.146, 0.106, 5);
seq11 = distribution(0.02, 0.126, 0.146, 0.106, 5);
seq12 = distribution(0.02, 0.126, 0.146, 0.106, 5);

seq13 = distribution(0.02, 0.126, 0.146, 0.106, 5);
seq14 = distribution(0.02, 0.126, 0.146, 0.106, 5);
seq15 = distribution(0.02, 0.126, 0.146, 0.106, 5);
if trial == 1 
DrawFormattedText(window, 'Name the color nn Press Any Key To Begin',...
'center', 'center', black);
Screen('Flip', window);
KbStrokeWait;
end

if randtemp() == 0
% trail 1
Screen('DrawText', num2str(seq1), white, randpos(1));
Screen('DrawText', num2str(seq2), white, randpos(2));
Screen('DrawText', num2str(seq3), white, randpos(3));
WaitSecs(0.75)
Screen('Flip', window);
KbStrokeWait;

Screen('DrawText', num2str(seq2), white, randpos(1));
Screen('DrawText', num2str(seq3), white, randpos(2));
WaitSecs(0.75)
Screen('Flip', window);
KbStrokeWait;

%trial 2
%repeat

else 
Screen('DrawText', num2str(seq13), white, randpos(1));
Screen('DrawText', num2str(seq14), white, randpos(2));
Screen('DrawText', num2str(seq15), white, randpos(3));
WaitSecs(0.75)
Screen('Flip', window);
KbStrokeWait;

Screen('DrawText', num2str(seq13), white, randpos(1));
Screen('DrawText', num2str(seq14), white, randpos(2));
WaitSecs(0.75)
Screen('Flip', window);
KbStrokeWait;
end
end       


% Flip to the screen
Screen('Flip', window);
% Wait for a key press
KbStrokeWait;
% Clear the screen
sca

"分布"函数是一个自制的函数，它生成具有指定均值、方差、上限、下限和给定数量的随机数的高斯分布：

function distribution(va, mu, ul, ll, nvals)
multiplier=10;
x = mu + randi(multiplier*nvals,1)*sqrt(va); % Generate sufficient random numbers
idx = (ll <= x) & (x <= ul); % Extract the value in the given range [min max]
while sum(idx)<nvals
multiplier=multiplier+1;
x = mu + randi(multiplier*nvals,1)*sqrt(va); % Generate sufficient random numbers
idx = (ll <= x) & (x <= ul); % Extract the value in the given range [min max]
end
x = x(idx);
x = x(1:nvals); % Extract numbers

您只看到灰色屏幕，因为错误不会导致Psychtoolbox窗口(您已将其设置为灰色背景(关闭。要关闭屏幕并显示错误，请将代码包装在try，catch语句中，如果遇到错误，该语句将关闭屏幕并重新引发错误。

例如(这里的CODE只是一个占位符，而不是用实际的代码替换它(

try
CODE
catch e
sca;
rethrow(e)
end

在这种情况下，如果在try语句的主体中遇到错误，它将转到catch语句，调用错误e。首先用sca关闭屏幕，然后通过rethrow实际显示错误。

就你遇到的实际错误而言，我认为你当前的代码至少有几个问题：

Psychtoolbox中的Shuffle函数是大写的-"Shuffle"和具有单个输入。在这里，您使用"shuffle"，并提供三个独立的输入。
不是提供"左"、"右"one_answers"上"作为单独的输入，将它们组合成一个单元阵列的元素：
替换：randpos = shuffle(left, right, up);
带有：randpos = Shuffle({left, right, up});
并选择它们作为单元阵列的元素：
替换：Screen('DrawText', num2str(seq1), white, randpos(1));
带有：Screen('DrawText', window, num2str(seq1), white, [], black, randpos{1}(1), randpos{1}(2));
在您定义的分布函数中，没有包含输出参数。将当前的第一个功能行替换为：function x = distribution(va, mu, ul, ll, nvals)
没有输入参数的KbStrokeWait只检查连接的第一个键盘。例如，如果您在笔记本电脑上使用外部键盘，这可能会忽略按键。使用KbStrokeWait(-3)将检查所有连接的设备。
你的分布函数似乎要么没有收敛于一个解，要么需要很长时间来确定一个解。因为它似乎是随机生成值，然后检查在你想要的区间内是否有足够的值。相反，我会从构建的函数开始生成随机法线值。例如，以下将从具有0.02的平均值和0.126的方差的分布生成5个值。不过，它并没有实现检查所有生成的值是否在给定范围内：randn(1, 5) * sqrt(0.126) + 0.02;
在对DrawText的调用中缺少窗口指针。

可能还有其他问题，但解决这些问题会让您开始。

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