plot N*N pane questions

I want to plot a N*N pane figure, N is an integer.Who know how can I do that? Thanks in advance; any comments will be appreciate.

[chengxuan yu]

Frankly speaking, I want to write a program that can realize the "Memory Matrix". This is part of that. So I hope your help.

[Walter Roberson]

What is "Memory Matrix" in this context?

Would it work for your purposes to turn on grid lines with the ticks set 1 unit apart?

[chengxuan yu]

I have already plot the pane. The programme is below.

a=ones(270,270);
a=a*25;
for i=1:10
   a(max(1,(i-1)*30):max(1,(i-1)*30)+1,:)=0;
   a(:,max(1,(i-1)*30):max(1,(i-1)*30)+1)=0;
end
figure;
imshow(a,[]);

The Memory Matrix is a way to improve one's memory.

I can't describe it detailed. The website below is about that, you can easy understand what is it. ( http://www.lumosity.com/brain-games/memory-games/memory-matrix?utm_source=SilverpopMailing&utm_medium=email&utm_campaign=WelcomeF_S5_Poster1_2012.05.21&utm_content=&ll_src=WelcomeF_S5_Poster1_2012.05.21&ll_ch=EMAIL&ll_u=21856609&spMailingID=5346211&spUserID=MzAwODI5NzQ0ODIS1&spJobID=201868856&spReportId=MjAxODY4ODU2S0)

[Walter Roberson]

Okay, so what is remaining for your question?

[chengxuan yu]

Sorry for the long time no come. Because my family has some circs. I just realize plot the pane. And I don't konw how to come true that game. I konw it should be progammed in GUI. But i should know the basic programme first. The following step that I want to konw is how to fill the N pane among the 10*10 pane to black? N is random. Thank you for your help first.

[Image Analyst]

Hmmmm.... Looks like Google Translate didn't do such a good job on that one. Maybe if you reviewed some of Doug Hull's video tutorials ( http://blogs.mathworks.com/videos/) on GUI development you might learn how to do whatever it is that you want to do.

Answer 1

[Walter Roberson]

pane = zeros(10,10);
temp_idx_to_fill = randperm(numel(pane));
idx_to_fill = temp_idx_to_fill(1:N);
[row_to_fill, col_to_fill] = idx2sub(size(pane), idx_to_fill);

Now fill the locations at [row_to_fill(1), col_to_fill(1)], [row_to_fill(2), col_to_fill(2)] and so on.

[chengxuan yu]

In your programme I didn't understand the function of idx2sub and matlab can not recognise it.

[Walter Roberson]

Sorry I should have written ind2sub() instead of idx2sub()