I need help with transect plot

Hello MatLabers, I am new to the field and I am full of doubts about how I could face this challenge in the best possible way. I have a series of oceanographic data. And I would like to profile a transect with temperature data.

I have had a lot of trouble with the length of them. But let's go to what matters, on the Y axis, I have a maximum depth of 30 meters, and on the X axis, from 0 to 2000 meters. I have 5 measurement points (200m, 600m, 1000m, 1400m and 1800m). How can I partition my plot to set the position of these 5 points?

WHAT I HAVE

WHAT I WHANT

I thank you in advance for any guidance to solve this problem!

Answer 1

[menia]

I believe this answer will help:

https://it.mathworks.com/matlabcentral/answers/358421-color-plot-y2-as-a-function-of-x-y1

[pedro rodrigo]

I've made some progress in my goal, but I still need to work on two approaches:

1 - How can I fill in the blanks of the interpolated data while maintaining the current positions?

2 - How can I use 'area' to fill my bathymetry data, being I flip the direction of the y-axis (like negative area?)

Thank you in advance for any direction you can help me!

%x = x.'                     % invert axis

%new life
clear; 
close all; 
clc;
%Summon data
data = xlsread('pernada1.xls');


    %Create all vectors with the same size
    %depth in each point
    d1 = data(:,1);
    d2 = data(:,3);
    d3 = data(:,5);
    d4 = data(:,7);
    d5 = data(:,9);
    dall = [d1;d2;d3;d4;d5]; 
    %temp in each point
    t1 = data(:,2);
    t2 = data(:,4);
    t3 = data(:,6);
    t4 = data(:,8);
    t5 = data(:,10);
    tall = [t1;t2;t3;t4;t5];
    
    
%Aternative to fill the bottom of that matrix with NaN values    
Nmax = max([length(d1),length(d2),length(d3),length(d4),length(d5)]);
E = 5;                      % number of stations
T = NaN( Nmax , E );        % create a matrix filled with NaN values
T( 1:length(t1) , 1) = t1;  % fill in the first column of the matrix with t1
T( 1:length(t2) , 2) = t2;  % fill in the second column of the matrix with t2
T( 1:length(t3) , 3) = t3;  % fill in the second column of the matrix with t3
T( 1:length(t4) , 4) = t4;  % fill in the second column of the matrix with t4
T( 1:length(t5) , 5) = t5;  % fill in the second column of the matrix with t5


%Distribution of functions in the plot
x = 200:400:2000;            % Define x vector of station locations
z = d4;                      % Define z vector of max depths 
%z = d4;                      % Define z vector of max depths 

figure;                      % Create new figure window
pcolor(x,z,T);               % Create plot of temperature
colorbar;
hcb=colorbar;
title(hcb,'Temperature');
%contourf(x,z,T,'ShowText','on');    %countourf with labels
shading interp;              % Remove visible mesh and set colours to be interpolated
set(gca,'ydir','reverse');   % Flip the direction of the y-axis

% Setting axis
xlim([0,2000]); 
ylim([0,30]); 

hold on

%Bathymetry with 127 values
%bathymetry = [0 0.4 0.8 1.01 1.33 1.66 1.80 2.33 2.83 2.98 3.02 3.15 3.29 3.53 3.83 4.53 4.67 4.99 5.83 6.37 7.44 8.53 9.79 9.82 9.97 10.22 10.86 11.62 12.48 12.87 13.92 14.29 14.72 15.57 15.92 16.16 16.88 17.10 17.67 18.08 18.45 19.22 19.72 20.09 20.62 21.3 21.42 21.97 22.42 22.94 23.11 23.34 23.8 24.02 24.21 24.53 24.86 25.01 25.12 25.28 25.53 25.74 25.99 26.11 26.27 26.36 26.45 26.57 26.61 26.72 26.91 26.61 27.02 27.08 27.11 27.18 26.78 26.18 25.75 25.11 24.76 24.48 24.33 24.29 24.12 24.08 23.99 23.87 23.72 23.66 23.59 23.27 23.08 23.01 22.9 22.42 22.14 21.87 18.79 17.55 16.79 15.92 15.21 14.09 13.45 12.09 11.77 10.89 10.57 10.34 10.29 10.17 9.94 9.79 8.62 7.29 6.78 5.67 4.79 3.98 2.79 2.11 1.25 0.4 0.2 0.1 0];
%bathymetry = bathymetry.' 
%plot(x, bathymetry)

    %Transect with 150 values
    %transect = [1:13.33:2000];
    %Transect with 127 values
    transect = [1:15.748:2000];
    %Bathymetry with 150 values
    %bathymetry = [0 0.4 0.8 1.01 1.33 1.66 1.80 2.33 2.53 2.83 2.98 3.02 3.15 3.29 3.53 3.83 4.53 4.67 4.99 5.53 5.83 6.37 7.44 8.53 9.73 9.79 9.82 9.97 10.02 10.22 10.86 11.62 11.92 12.48 12.87 13.92 14.29 14.38 14.72 15.57 15.92 16.02 16.16 16.88 17.10 17.32 17.67 18.08 18.45 18.86 19.22 19.72 20.09 20.62 20.88 21.3 21.42 21.65 21.97 22.2 22.42 22.94 23.11 23.34 23.8 24.02 24.21 24.53 24.86 25.01 25.12 25.28 25.53 25.74 25.99 26.11 26.27 26.36 26.45 26.57 26.61 26.72 26.91 26.61 27.02 27.08 27.11 27.18 26.78 26.54 26.18 25.75 25.11 24.76 24.56 24.48 24.33 24.29 24.17 24.12 24.08 23.99 23.87 23.72 23.66 23.59 23.39 23.27 23.08 23.01 22.9 22.42 22.14 21.87 20.4 18.79 17.55 16.79 15.92 15.21 14.09 13.45 12.09 11.77 11.01 10.89 10.57 10.34 10.29 10.17 9.94 9.79 8.62 7.29 6.78 5.67 4.79 3.98 2.79 2.11 1.25 0.4 0.3 0.2 0.1 0.1 0 0 0 0];
    %Bathymetry with 127 values
    bathymetry = [0 0.4 0.8 1.01 1.33 1.66 1.80 2.33 2.53 2.83 2.98 3.02 3.15 3.29 3.53 3.83 4.53 4.67 4.99 5.83 6.37 7.44 8.53 9.73 9.79 9.82 9.97 10.02 10.22 10.86 11.62 11.92 12.87 13.92 14.29 14.72 15.57 15.92 16.02 16.16 16.88 17.10 17.32 17.67 18.08 18.45 18.86 19.22 19.72 20.09 20.62 20.88 21.3 21.42 21.65 21.97 22.2 22.42 22.94 23.11 23.34 23.8 24.02 24.21 24.53 24.86 25.01 25.12 25.28 25.53 25.74 25.99 26.11 26.27 26.36 26.45 26.57 26.61 26.72 26.61 26.91 27.02 27.08 27.11 27.18 26.78 26.54 26.18 25.75 25.11 24.76 24.56 24.48 24.33 24.29 24.17 24.12 24.08 23.99 23.87 23.72 23.66 23.59 23.39 23.27 23.08 23.01 22.9 22.42 22.14 21.87 20.4 18.79 17.55 16.79 15.21 13.45 11.01 9.94 8.62 4.79 3.98 2.11 1.25 0.3 0.1 0];
      
    bathymetry = bathymetry.';  %give vector pattern orientation
    transect = transect.';      %give vector pattern orientation
    plot(transect, bathymetry)
    %area(transect, bathymetry)
  
    
title ('Transect almost there!!')
xlabel ('Transect')
ylabel ('Depth')