# How can I draw contour lines in my problem ?

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Hi all,

I have created cell array(which is attached here) in which the first and second columns representing latitude and longitude of each weather station exisitng in the Alaska state. The third column is the probability that freezing depth in that station exceeds 1 feet. What I want to do is plot contour lines represing the probability values. Can anyone help me with regard?

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### Accepted Answer

Voss
on 6 Feb 2023

load Behi1

data = cell2mat(POFDE1);

I = scatteredInterpolant(data(:,[1 2]),data(:,3));

[lat,lon] = meshgrid(unique(data(:,1)),unique(data(:,2)));

contour(lon,lat,I(lat,lon),'ShowText','on')

colorbar

### More Answers (2)

Divyank
on 6 Feb 2023

The contour plot requires z-coordinates to be specified as a matrix and this matrix must have at least two rows and two columns, and it must contain at least two different values. However, the z-coordinates in POFDE1 is 1x273 cell array, according to my understanding of your problem, you can consider using plot3(X, Y, Z) instead of contour after extracting X, Y and Z co-ordinates from POFDE1 cell array in the following way:

% The input needs to be a scalar, vector or a matrix, hence conversion from

% cell array to vector is needed in this case, you might want to construct

% a matrix instead of a cell array to avoid this conversion.

X = cell2mat(POFDE1(:, 1));

Y = cell2mat(POFDE1(:, 2));

Z = cell2mat(POFDE1(:, 3));

plot3(X, Y, Z, '.');

##### 1 Comment

Walter Roberson
on 6 Feb 2023

The user specifically asked for contour lines. Voss shows one way of doing scattered contour.

Walter Roberson
on 6 Feb 2023

##### 0 Comments

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