Matrix Dimension Must Agree

Hi I want to ask why 'matrix dimension must agree' is happen during running the coding for plotting the HDF5 data.

Here is my coding, i also attach the sample data

Error using pcolor (line 56)

Matrix dimensions must agree.

Error in hdf5 (line 13)

pcolor(lon_ncep,lat_ncep,var1);

% clear all

% close all

% clc

%

file=hdf5info('Q2014031.L3m_DAY_SCI_V5.0_SSS_1deg')

dset1=hdf5read(file.GroupHierarchy.Datasets(1));

dset2=hdf5read(file.GroupHierarchy.Datasets(2));

var1 = dset1

var1 = rot90(fliplr(var1));

var1(var1==-3.2767)=NaN;

lat_ncep = linspace(0,14,360);

lon_ncep = linspace(95,126,180);

pcolor(lon_ncep,lat_ncep,var1);

shading flat

c = colorbar;

ylabel(c,'C')

load coast

hold on

plot(long,lat,'black')

title('GSSTFM NCEP Sea Surface Temperature')

xlabel('degrees longitude')

ylabel('degrees latitude')

Answer 1

[Sachin]

Hi @MAT NIZAM UTI

I understand that you are getting this error 'Matrix dimensions must agree'.

This is because of matrix dimensions of the matrices being used in your code do not match.Specifically, when you are using pcolor function then the size of inputs to the function must be of the same size.

Therefore, to resolve this error, you need to ensure that the matrices you are using with the 'pcolor' function have the same dimensions.

• ‘lat_ncep’ has dimensions as 1 * 360
• ‘lon_ncep’ has dimensions as 1 * 180

pcolor(lat_ncep,lon_ncep,var1) function have three inputs ‘lat_ncep’,’lon_ncep’ and ‘var1’ . So They all must be of the same dimensions.

Refer the following page for more information about pcolor:

https://www.mathworks.com/help/matlab/ref/pcolor.html

[MAT NIZAM UTI]

Thank you for the response,

Can I ask another question, may I know if there any way for me to arrange the data into Lat, Long, dset1 matrix ?