Error using * Inner matrix dimensions must agree.

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misbah 0332
misbah 0332 2015-3-4
评论： David Young 2015-3-4
close all;
clear all;
clc;
%x(n) = u(n) – u(n – 6)
n1 = -1:1:6; %range of x-axis
x1 = [zeros(1,1), ones(1,6),zeros(1,1)]; %signal at y-axis
subplot(3,1,1); %subplot location
stem(n1,x1); %discreet plot
xlabel('time'); %labeling
ylabel('Amplitude'); %labeling
title('x(n) = u(n) – u(n – 6)'); %labeling
%h(n) = 2^n {u(n) – u(n – 3)
n2 = -1:1:3; %range of x-axis
x2 = [zeros(1,1),ones(1,3),zeros(1,1)]; %signal at y-axis
x2 = (2.^n2).*x2; %signal at y-axis
subplot(3,1,2); %subplot location
stem(n2,x2); %discreet plot
xlabel('time'); %labeling
ylabel('Amplitude'); %labeling
title('h(n) = 2^n {u(n) – u(n – 3)'); %labeling
x1k = fft(x1);
x2k = fft(x2);
y = x1k * x2k;
y2 = ifft(y);
subplot(3,1,3);
stem(y2);
  2 个评论
David Young
David Young 2015-3-4
As you can see, your code is very hard to read. You can fix this by editing it and using the "{} Code" button.

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回答（1 个）

David Young
David Young 2015-3-4
It's likely that this line
y = x1k * x2k;
should be
y = x1k .* x2k;
The * operator does matrix multiplication, but .* does array multiplication which is probably what you need here.
  2 个评论
David Young
David Young 2015-3-4
Then I guess you need to give more information. That's the only occurrence of * in the code you have shown, so the error must be elsewhere. Please can you give the full error message, and say which line of code produces it.

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