Discrepancy in imagesc from given matrix

I want to plot a heatmap of a matrix with corresponding values of d1 and d2 using imagesc

%Relevant code
d1=linspace(0.1,2.2,200);
d2=linspace(0.1,2.2,200);
x=d1;
y=d2;
z=readmatrix('Plant.csv');
imagesc(x,y,z)
colorbar
colormap(flipud(hot))
set(gca,'YDir','normal')

d1(150)=1.67

d2(50)=0.6

z(150,50)=0.43

However according to the plot z(150,50)=0; this is very confusing to me am I using imagesc wrong

Answer 1

[Walter Roberson]

Remember that z(150,50) is z at the 150th Y value and the 50th X value. Rows correspond to Y not to X.

[Suchetana Mitra]

So should the command be (d2,d1,z) instead?

the syntax said (x,y,z) so that's what I used

[Walter Roberson]

Your d1 and d2 are the same, so it doesn't matter if you surf(d1,d2,z) or surf(d2,d1,z)

surf(x,y,z) is correct syntax, and the way you created x and y are fine.

The difficulty is that you are looking at z(150,50) and thinking that displays at the 150'th x and the 50'th y, when instead it displays at the 150'th y and the 50'th x. The problem is not with constructing the x and y and z or the surf, the problem is your mental mapping from row and column to x and y. Row --> y, column --> x .

[Suchetana Mitra]

Ohh in that case what I really want to plot is probably the transpose of this matrix

[Suchetana Mitra]

Thank you so much!!