how to find the value of an index in a for loop

lonP = 14.3;
latP = 40.4;
limlon=[min(longrd),max(longrd)];
limlat=[min(latgrd),max(latgrd)];
ic=0; 
for i=1:length(longrd)         
    for j=1:length(latgrd)
        ic=ic+1;
        lonlatgrd(ic,1)=longrd(i);
        lonlatgrd(ic,2)=latgrd(j);
    end
end 
grid_ang = calcola_ang_jacopo1(lonlatgrd,[lonP,latP]);        %angles
for i2=1:length(grid_ang)                        
    angsel=grid_ang(i2)*180/pi;
end

with this script and this function that I have attached, within this grid I have to try to identify the values of the i2 index in the different points of the grid. I have to try to understand how the values vary within the grid. Can anyone help me?

Answer 1

[Luca Ferro]

if you just want to see how it varies numerically, print it:

for i2=1:length(grid_ang)

angsel=grid_ang(i2)*180/pi;

sprintf('%d ',i2) %EDIT: correcting a typo, see comments fro more

end

if you want to see how it varies graphically, plot it:

for i2=1:length(grid_ang)

angsel=grid_ang(i2)*180/pi;

id2_idx(i2)=i2; %store in in an array

end

plot(id2_idx,grid_ang) %plot it against the grid

[ELISABETTA BILLOTTA]

it does not work.

in the first case it gives me the error "Unrecognized function or variable 'i_idx'."

and in the second case "Error using plot. Vectors must be the same length."

[Luca Ferro]

in the first one there is a typo, im sorry:

for i2=1:length(grid_ang)

angsel=grid_ang(i2)*180/pi;

sprintf('%d ',i2) %here is the typo, instead of i2_idx is just i2

end

The second one works on my machine, try to put a breakpoint on the plot line and check the dimensions of id2_idx and grid_ang and share them here