## Questions about the input X of pcolor and contourf.

I have two questions, the first one is:

In the documentation of pcolor

the input arguments X is described as follows:

x-coordinates, specified as a matrix the same size as C, or as a vector of length n, where [m,n] = size(C). The default value of X is the vector (1:n).

To create a rectangular grid of vertices, specify X as either of the following:

A vector containing values that are increasing or decreasing.

A matrix that is increasing or decreasing along one dimension and is constant along the other dimension. Set the dimension that varies to the opposite of the dimension that varies in matrix Y. You can use the meshgrid function to create the X and Y matrices.

To create a parametric grid, create a rectangular grid and pass it through a mathematical function.

But in its case of specifying Parametric Grid, X and Y don’t follow do not meet the above requirement, which is "A matrix that is increasing or decreasing along one dimension and is constant along the other dimension. Set the dimension that varies to the opposite of the dimension that varies in matrix Y."

I wonder if that means you can use X and Y coordinates for scatter points, for example:

X = [1 2 3; 2 3 4; 3 4 5]

Y = [1 1 1; 2 2 2; 3 3 3]

And the second one is:

In the documentation of contourf

x-coordinates, specified as a matrix the same size as Z, or as a vector with length n, where [m,n] = size(Z). The default value of X is the vector (1:n).

When X is a matrix, the values must be strictly increasing or decreasing along one dimension and remain constant along the other dimension. The dimension that varies must be the opposite of the dimension that varies in Y. You can use the meshgrid function to create X and Y matrices.

When X is a vector, the values must be strictly increasing or decreasing.

I wonder if that I can use X and Y coordinates for scatter points, for example:

X = [1 2 3; 2 3 4; 3 4 5]

Y = [1 1 1; 2 2 2; 3 3 3]I have two questions, the first one is:

In the documentation of pcolor

the input arguments X is described as follows:

x-coordinates, specified as a matrix the same size as C, or as a vector of length n, where [m,n] = size(C). The default value of X is the vector (1:n).

To create a rectangular grid of vertices, specify X as either of the following:

A vector containing values that are increasing or decreasing.

A matrix that is increasing or decreasing along one dimension and is constant along the other dimension. Set the dimension that varies to the opposite of the dimension that varies in matrix Y. You can use the meshgrid function to create the X and Y matrices.

To create a parametric grid, create a rectangular grid and pass it through a mathematical function.

But in its case of specifying Parametric Grid, X and Y don’t follow do not meet the above requirement, which is "A matrix that is increasing or decreasing along one dimension and is constant along the other dimension. Set the dimension that varies to the opposite of the dimension that varies in matrix Y."

I wonder if that means you can use X and Y coordinates for scatter points, for example:

X = [1 2 3; 2 3 4; 3 4 5]

Y = [1 1 1; 2 2 2; 3 3 3]

And the second one is:

In the documentation of contourf

x-coordinates, specified as a matrix the same size as Z, or as a vector with length n, where [m,n] = size(Z). The default value of X is the vector (1:n).

When X is a matrix, the values must be strictly increasing or decreasing along one dimension and remain constant along the other dimension. The dimension that varies must be the opposite of the dimension that varies in Y. You can use the meshgrid function to create X and Y matrices.

When X is a vector, the values must be strictly increasing or decreasing.

I wonder if that I can use X and Y coordinates for scatter points, for example:

X = [1 2 3; 2 3 4; 3 4 5]

Y = [1 1 1; 2 2 2; 3 3 3] I have two questions, the first one is:

In the documentation of pcolor

the input arguments X is described as follows:

x-coordinates, specified as a matrix the same size as C, or as a vector of length n, where [m,n] = size(C). The default value of X is the vector (1:n).

To create a rectangular grid of vertices, specify X as either of the following:

A vector containing values that are increasing or decreasing.

A matrix that is increasing or decreasing along one dimension and is constant along the other dimension. Set the dimension that varies to the opposite of the dimension that varies in matrix Y. You can use the meshgrid function to create the X and Y matrices.

To create a parametric grid, create a rectangular grid and pass it through a mathematical function.

But in its case of specifying Parametric Grid, X and Y don’t follow do not meet the above requirement, which is "A matrix that is increasing or decreasing along one dimension and is constant along the other dimension. Set the dimension that varies to the opposite of the dimension that varies in matrix Y."

I wonder if that means you can use X and Y coordinates for scatter points, for example:

X = [1 2 3; 2 3 4; 3 4 5]

Y = [1 1 1; 2 2 2; 3 3 3]

And the second one is:

In the documentation of contourf

x-coordinates, specified as a matrix the same size as Z, or as a vector with length n, where [m,n] = size(Z). The default value of X is the vector (1:n).

When X is a matrix, the values must be strictly increasing or decreasing along one dimension and remain constant along the other dimension. The dimension that varies must be the opposite of the dimension that varies in Y. You can use the meshgrid function to create X and Y matrices.

When X is a vector, the values must be strictly increasing or decreasing.

I wonder if that I can use X and Y coordinates for scatter points, for example:

X = [1 2 3; 2 3 4; 3 4 5]

Y = [1 1 1; 2 2 2; 3 3 3] pcolor, contour, countourf MATLAB Answers — New Questions