I learned Mathematica's Fourier transform video, but when I input the same function as the video, I can't get the result of the plot, only the coordinate axis, no function image. When I solve a differential equation in another file(caculator.nb), it doesn't solve the result, but it does on wolfram online
The reason for doubious reponse: Its an ODE for y'. The algorithm has a problem to identify y[x] as a symbol string in a collection of Derivative[1|2|3 ][y][x].
Worrkaround: Solve for y'[x] = dy[x] etc and integrate the result for dy with respect to x.
My guess is that you had already entered the initial values as y[0]=1, y'[0]=0 etc. This would explain why the initial conditions become True in the output.
y[0]=1
y'[0]=0
True
I use mathematica13.0 to do this equation, as the first screenshot did not get the result. Only when I use online I can solve the equation. i don't understand why.
Wolfram Mathematica 13.2 result:
