Error message: Matrix Dimensions must agree

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Ian Strahley
Ian Strahley 2020-11-18
评论： Walter Roberson 2025-2-3
Not sure what I am doing wrong:
syms x
n = 0:1:100;
t = 0:0.1:50;
lamda = (n .* pi);
u = (100 .* cosd(lamda .* x) + (sind(lamda .* x)) .* (exp((-lamda .^ 2) .* t) ;
fplot(t,u)
grid on
Thank you

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回答（2 个）

Vinay
Vinay 2025-1-29
Hi @Ian Strahley,
The issue arises due to mismatch in matrix dimensions between "exp((-lambda .^ 2))" and "t", which are of sizes "1x101" and "1x501", respectively.
To resolve this issue, adjust the dimensions of the vector "t" to 1x101. This can be achieved by modifying the definition of t as follows:
t = 0:0.5:50;
I hope this resolves the query!
VBBV
VBBV 2025-2-3
Ran in:
Hi @Ian Strahley,
  • Use linspace to divide the data points uniformly for variables in the equation.
  • use a function handle, when plotting function fplot
  • Ensure the parenthesis are closed correctly
n = linspace(0,100,10);
t = linspace(0,50,10);
lamda = (n .* pi);
u = @(x) 100 .* cosd(lamda .* x) + (sind(lamda .* x) .* exp((-lamda .^ 2) .* t)) ;
fplot(u,[0 1])
grid on
●
  1 个评论
Walter Roberson
Walter Roberson 2025-2-3
use a function handle, when plotting function fplot
There are two different fplot() functions, one of which is defined for function handles, and the other (closely related) one is defined for symbolic expressions and symbolic functions. In theory, using fplot() with symbolic expressions should be fine, if a bit slower than the function handle case.

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