# nanContourf(xb,yb,x​,y,z)

Version 1.4.0.2 (2.92 KB) by
contourf with nans filled in precisely
Updated 8 Jul 2021

# nanContourf

Like contourf but fills in the nans nicely given grid borders.

### Example

Code:

```% start from peaks, cropped for asymmetry
z = peaks ;
z(end,:) = [] ;

% some coordinate system
x = sin(linspace(-1,1,size(z,2))) ;
y = log(linspace(1,3,size(z,1))) ;

% create some nan islands and lakes
iznan = find(flipud(sin(z))>.5) ;
z(iznan) = nan ;

% usual contourf
subplot(2,1,1)
contourf(x,y,z)
title('usual contourf')

% nanContourf (needs border coordinates)
% so I create some around x and y
subplot(2,1,2)
xb = (x(2:end)+x(1:end-1))/2 ;
xb = [2*x(1)-xb(1) xb 2*x(end)-xb(end)] ;
yb = (y(2:end)+y(1:end-1))/2 ;
yb = [2*y(1)-yb(1) yb 2*y(end)-yb(end)] ;
nanContourf(xb,yb,x,y,z)
title('nanContourf')```

### AWESOME OCIM example:

```figure(1)
TRACER = (cosd(ao.LAT) + sind(ao.LON) + cosd(ao.DEPTH / 100)) ;
TRACER(find(~ao.OCN)) = nan ;
TRACER_Slice = squeeze(TRACER(:,100,:)) ;
contourf(ao.lat, ao.depth, TRACER_Slice')
set(gca,'YDir','reverse')

figure(2)
z = ao.depth ;
zb = [0 cumsum(ao.height)] ;
y = ao.lat ;
dy = y(2) - y(1) ;
yb = [y(1) - dy/2    y + dy/2] ;
nanContourf(yb, zb, y, z, TRACER_Slice') ;
set(gca, 'YDir', 'reverse')```

### Cite As

Benoit Pasquier (2024). nanContourf(xb,yb,x,y,z) (https://github.com/briochemc/nanContourf/releases/tag/v1.4.0.2), GitHub. Retrieved .

##### MATLAB Release Compatibility
Created with R2012a
Compatible with any release
##### Platform Compatibility
Windows macOS Linux

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Version Published Release Notes
1.4.0.2

See release notes for this release on GitHub: https://github.com/briochemc/nanContourf/releases/tag/v1.4.0.2

1.4.0.1

See release notes for this release on GitHub: https://github.com/briochemc/nanContourf/releases/tag/v1.4.0.1

1.4.0.0

See release notes for this release on GitHub: https://github.com/briochemc/nanContourf/releases/tag/v1.4.0.0

1.3.2.0

cleaned description of function and code

1.3.1.0

commented and simplified code a bit

1.3.0.0

changed a lot. Now fills the nan boxes individually. This enables to deal with 'lakes' but creates a problem when printing to eps.

1.1.0.0

Added an extrapolation (inpaint_nans) to get rid of the white borders of nans.
just got rid of the v2 in the top right sublot

1.0.0.0

added the fact it does not work for 'lakes'

To view or report issues in this GitHub add-on, visit the GitHub Repository.
To view or report issues in this GitHub add-on, visit the GitHub Repository.