Hi, I want to use PyPlot (I don’t like Plots) for plotting a surface, but I seem to miss how this is done. I have a 1D-array of x values, a 1D-array of y values, and a 2D array z of f(x,y) values. In this case length(x)=length(y) and size(z)=(length(x),length(y)). What is the proper way to genera…

Please give a MWE that is copy-pastable and tell us what you have tried so far that doesn’t work.

something like this perhaps x = range(-3,stop=3,length=20) y = range(1,stop=7,length=25) z = fill(NaN,(length(x),length(y))) #to put results in, initialized as NaNs for j = 1:length(y) #create z column by column z[:,j] = 2*x.^2 .+ (y[j]-4)^2 end #notice the arguments: x,y,z' p…

I’m not sure why you “don’t like Plots” since the following just works in Plots.jl: julia> using Plots julia> x = y = -1:0.1:1; 1:10 julia> z = x .^ 2 .+ y' .^ 2; julia> surface(x, y, z)

[image] Ferran_Mazzanti: help states that x,y,z must be 2D arrays… why 2D-arrays? x and y are 1D values, right? Haven’t used it in a while but indeed I kind of remember this being the case, but maybe it was changed to allow 1D arrays, e.g. on matplotlib 3.2.2 / PyPlot 2.9.0 basically the iden…

In python those functions receive 2D arrays for the coordinates (unless they have changed it in recent versions as mentioned by @marius311 ). This is, you specify the x and y positions for each point of the array, and not only for each row and each column. A function that is useful to build those arr…

I seem to be having a similar problem as the OP, but I cannot figure out a solution for unequal x and y array lengths, the .^ or .* operators don’t work, or as suggested as a replacement to meshgrid, using a z = [f(xs, ys) for xs in x, ys in y] and then plotting doesn’t work either.

@Yuktee_Gupta , have you checked this post ?

Welcome to the Julia Discourse! Please post a MWE, i.e. a Minimal Working Example (or in this case, a non-working example!) – in other words, a simple version of the data you want to plot and what exactly you tried.

Surface plotting using PyPlot

General Usage

mgr February 2, 2021, 1:28am 7

A recent discussion on why one doesn’t need meshgrid in Julia is at Meshgrid function in Julia

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Surface plotting using PyPlot

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