Why I can't display all the decimal digits in a plot?

My code converts a 2-columns string array (first image) into a 2-columns double array. After the conversion, the numbers in the matrix are cut off after the 4th decimal digits (second image) (I need 6 decimal digits) and if I plot the data, only the time axis values are cut off, this time after the 2nd decimal digit! (third figure) while the y axis data have all the 6 decimal digits required. How is it possible ?

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Answer 1

[KL]

format long

[stefano luna]

This command is to display numbers in the command window, it doesn't work on charts.

[KL]

Do you want the data cursor to have more accuracy?

function txt = myupdatefcn(empt,event_obj,str)
pos = get(event_obj,'Position');
px = sprintf(str,pos(1));
py = sprintf(str,pos(2));
txt = {['X: ' , px],['Y: ' , py]};
end

and

function ret = fixplot1(str),
set(datacursormode(gcf),'UpdateFcn',{@myupdatefcn, str});
end

and then call it like this,

plot(1:0.0000001:1.5), fixplot1('%1.8f');

found this here .

[stefano luna]

That's what I was looking for, Thank you very much!

[Elforjani Jera]

Perfect solution. I was looking for the same thing too.

Thank you

Answer 2

[Ata ur rahman Mohammed]

The better solution is just update the number of decimal points in "text function". In data cursor mode, right click and select "edit text update function", in the variable output_txt= 'X: '. num2str(pos(1),4)]; update the 4 to 6 or 10, this defines total number of digits on the X axis data display. Hope this helps. Found from ALEX WINTEER's Commenthttps://groups.google.com/forum/#!searchin/comp.soft-sys.matlab/subject$3A%22Data$20cursor$20precision%22/comp.soft-sys.matlab/xEJlCB_e-X8/gMDlZZC7vb0J

[Hernan Larriva]

It wasw useful for me, thanks!

[Badrul Huda Husain]

Hi.. I'm quiet new in Matlab..would you guys tell me which command do I have to edit to make coordinate position digits more precise ? I try to following your discussion to edit "text function"in matlab R2020a

..I am attaching photo from my Matlab command

[CARLOS SILVA]

It was very helpful for me!

Thank you very much!

Answer 3

[Walter Roberson]

You are using the Variable viewer. See the Preferences to use long format instead of short.

[stefano luna]

What you suggested me is the same KL told me in his first answer to put

format long

but in this way, I can fix only the numbers shown in the command windows. Thank you anyway for your answer.

[Walter Roberson]

This is not the same as "format long". "format long" only affects displaying values to the command window. The Preferences affects the format of the Variable Browser.