contourf function mistake for mapping

I am running a scritp for plotting the electromagnetic field under particular conditions.

however, I have problems with the use of the command

'contourf '

The error is the following

Error using contourf

Vector X must be strictly

increasing or strictly

decreasing with no repeated

values.

Error in

file

(line 90)

contourf([x./period-1

x./period x./period+1],

fliplr(z./period),

Z_E_intensity, v );

How should I check which one is the function which is wrong.

[Walter Roberson]

Suppose x/period = linspace(0,1) then subtract 1 would go from -1 to 0, then original value would be 0 to 1, then add 1 would be 1 to 2. But notice that 0 exactly occurs twice and 1 exactly occurs twice. Be careful concatenating full periods.

Answer 1

[Cris LaPierre]

It says the issue is with vector X, so the problem is in x./period-1

The result must be strictly increasing or decreasing, and contain no duplicate values. The same is true for vector Y, or x./period in your code.