How to make a matrix has more pixels?

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Oliver Lestrange 2020-8-18

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评论： Walter Roberson 2020-8-18

采纳的回答： Rik

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Hi,

Apparently when I use the following code I am creating a matrix with 15x15 pixels.

dmin1=2;
n=15; 
manhattan=ones(n,n,3); 
manhattan(2:dmin1:end,2:dmin1:end,:)=0;
imwrite(manhattan,'matrix_15x15.png');

How can I make it bigger, in order to see the black points (the 0's) bigger?

To make something like:

Supose that the 0's are 32 pixel...

Then I do something like 32 pixel are 20 meters...

So, I need the 0's be bigger than 1 pixel.

Any suggestion?

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Oliver Lestrange 2020-8-18

Walter Roberson, are you saying that with the checkerboard function I can display the squares in other positioning other than chess?

Walter Roberson 2020-8-18

I am suggesting that checkerboard() is a function that creates a regular repeated pattern, and that studying how it is coded would give you ideas on how to form the regular repeated pattern that you want.

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采纳的回答

Rik 2020-8-18

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If you want to increase the size of the black and white parts in equal proportion, you can use the repelem function.

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Oliver Lestrange 2020-8-18

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Hi Rik,

Thanks a lot, it works, I didn't know this function.

Oddly now a rectangle putted with the help of the ginput function, stopped work.

It doesn't show the rectangle

function insertAntenna_Callback(hObject, eventdata, handles)
% hObject    handle to insertAntenna (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
handles  = guidata(hObject)
[x_gNB, y_gNB] = ginput(1);
handles.nAntena = handles.nAntena + 1
Antena_x = x_gNB;
Antena_y = y_gNB;
rectangle('Position', [(Antena_x - handles.Rwidth/2) (Antena_y - handles.Rheight/2)...
    handles.Rwidth handles.Rheight], 'FaceColor', 'r','LineStyle', 'none');
handles.Antena( handles.nAntena ).Antena_x = Antena_x;
handles.Antena( handles.nAntena ).Antena_y = Antena_y;
if ~myIsField(handles.Antena(1), 'handles.Antena(1).Info')
    handles.Antena(1).Info = readAntenna('Ant60.pln', strcat(pwd,'\'));
end
handles.Antena(handles.nAntena).Info = handles.Antena(1).Info;
handles.Antena( handles.nAntena ).Altura = handles.Antena_Altura;
guidata(hObject, handles)

Any ideia why?

Rik 2020-8-18

Did you make sure the Position property of the rectangle take the new image dimensions into account?

Oliver Lestrange 2020-8-18

The width and height were smaller than I thought. Thanks Rik

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