How can I make true false codition?

Hello, I have witten a code for automating two instruments. In my code I wrote in step by step but the camera is taking image instantly before completing the for loop. and the statement after the catureimage is also being executed instantly. I need to make condition where capture image will be performed when the desired array elements in the for loop becomes true. And i need to make a codition where the stop statement will ocuur if the acquired imge is done. Can anyone please help me with this? I have attached my code here:

dmd = uint8(ones(768,1024)); %dmd mirror matrix model 
store_results = uint8(zeros(768,1024)); %dummy matrix to track results i.e. what is positive, what is negative
myapi = alpload();
mydev = alpdevice(myapi);
%mydev.alloc();

%q1

for i = 1:512, j = 1:384; %row coordinate 300-400  previous[1:length(transpose(dmd))]%column coordinate 1: length(dmd);
    dmd(i,j) = 255  ; %set coordinate deliberately ON (pixel value??)400-500
    %******my frame******** 
    myframe = dmd;%... (your code to create an array 1024x768 of 'uint8') = dmd  %in the for loop 
    mydev.put(myframe);
    
end
%turn on camera, take image 
Image = captureimage();
% % % %stop dmd
mydev.stop();

Answer 1

[DGM]

My understanding is that you're manipulating the mirror array in the DMD and then taking an image. It's not clear why you're repeatedly setting the mirror to different states and then taking the image with the last state. The documentation for alpdevice.put is as useless as I've come to expect:

%  Sets pixel to given frame

Which makes it sound like the device needs to be updated elementwise. The usage of obj.put in the other methods (e.g. on and off) suggest that the entire frame is updated at once.

I'm inclined to think that you're trying to do it elementwise, but that's not how the loop is written.

% this loop
for i = 1:512, j = 1:384; 
    % ...
end

% is the same as this
for i = 1:512
    j = 1:384;
    % ...
end
% in other words, j is a literal vector and is not part of the iteration

If the entire frame can be updated at once, and the desired area is {1:384,1:512} (a quarter frame), then no loop is needed:

% do device setup ...

dmd = zeros(768,1024,'uint8');  
dmd(1:384,1:512) = 255;
mydev.put(myframe);

% turn on camera, take image 
Image = captureimage();

% do device release ...

Bear in mind that you're preallocating the dmd array using ones(). That means that the background element value is 1 instead of zero. You might want to be using zeros() instead of ones().

As to whether it's possible to interlock the process by verifying the device state, I don't know. I don't immediately see an obvious way to query the mirror state. There might be, but I don't see it yet.

[trinasha]

Thank you. It is now working instantly and simultaneously. Do you have documents of matlab code for DMD? It would be great if you can share the docs.

[DGM]

I don't know anything about working with DMDs. I just found ALPTool via web search and looked at the code synopses.

https://www.mathworks.com/matlabcentral/fileexchange/46673-alptool

Like I said, very terse synopses hardly qualifies as "documentation", but that's about what's expected.