How to show fractional values in plot

How do you show fractional values in plot for the x or y axis instead of decimal values.

For example show 1/298 instead of 3.3557e-3

I know you can manually label the axis but I dont know the end points. Is there a way to do this?

Thanks,

C

[Image Analyst]

You can do this to get the existing tick positions, including the end point ticks:

% Get existing tick marks.
existing_Y_Ticks = get(gca, 'YTick')

Answer 1

[Image Analyst]

Try this:

% Generate some sample data and plot it.
m = .04 * rand(20, 1);
plot(m);
grid on;

% Now convert the existing tick marks.
% Get existing tick marks.
existing_Y_Ticks = get(gca, 'YTick')
% Define the denominator we want to use.
denominator = 298;
% Find out what the numerators would be.
New_Y_Tick_Numerators = (existing_Y_Ticks * denominator)
% Now make up a cell array of all the tick labels.
for k = 1 : length(existing_Y_Ticks)
  y_tick_labels{k} = sprintf('%.1f / %d', New_Y_Tick_Numerators(k), denominator);
end
% Apply our tick marks to the plot.
set(gca,'YTickLabel',y_tick_labels);

[Walter Roberson]

If you do not know the denominator then you may wish to use the function to convert to rational numbers

[Image Analyst]

You mean rats()?

I suppose Mike could also change the tick marks to new values instead of using existing values, so maybe instead of having 5 tick marks with fractional values in the numerator like 1.1/298, 2.2/298, etc. you could have 6 or 7 tick marks with integer multiples of 1/298.