# How to insert grid lines specific position ?

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voxey on 20 Aug 2019
Commented: Adam Danz on 22 Aug 2019
How to insert grid lines specific position ? check this attached Imafe? How to insert grid line inside red line box on image?

darova on 20 Aug 2019
You can use plot
plot([800 1000] ,[600 250],'--g')
Or you want insert line into image?
Adam Danz on 20 Aug 2019
@darova , that plots a diagonal line.

Adam Danz on 20 Aug 2019
Here's a demo
% Define bound
%bound(1) is the x value of the bottom, left corner of the frame
%bound(2) is the y value for the same corner
%bound(3) is the width of the frame
%bound(4) is the height of the frame
bound = [.2 .1 .5 .7];
% Define grid
x = .3:.1:.6;
y = .2:.1:.7;
% Plot
cla()
xlim([0,1])
ylim([0,1])
hold on
rectangle('position', bound, 'EdgeColor','r')
% Plot vertical lines
vh = plot([x(:),x(:)],[bound(2),sum(bound([2,4]))], 'Color', [.6,.6,.6]);
% Plot horizontal lines
hh = plot([bound(1),sum(bound([1,3]))],[y(:),y(:)], 'Color', [.6,.6,.6])

Adam Danz on 21 Aug 2019
In my answer, these two lines define the placement of the grid line.
% Define grid
x = .3:.1:.6;
y = .2:.1:.7;
Assuming the image is placed in an axis where the bottom left corner of the axis is (0,0) and the top right corner is (7,9) (rough estimate from your drawing), then you can define the grid lines like this:
interval = 1; %distance between grid lines.
x = linspace(0,7,interval);
y = linspace(0,9,interval);
Give it a try. If you get stuck, share an image (or code) from the actual plot you're working with instead of a drawing.
voxey on 22 Aug 2019
its not working? can you share sample result with this code?
Adam Danz on 22 Aug 2019
My answer contains a fully functional sample with this code.
What's not working? What problems are you having? As I mentioned, if you get stuck, share the relevant sections of code (only the relvant sections that plot the grid). And carefully explain what's not working.