# I am unsure of how I am getting this error

1 ビュー (過去 30 日間)
Cameron Paterson 2021 年 10 月 27 日

r=linspace(0.001,1,1000);
s=0.75.*((r.^3)/(exp(1)^(.75.*r)));
subplot(2,2,1)
plot(r,s)
xlabel('x')
ylabel('y(x)')
axis([min(r) max(r) min(s) max(s)])
grid on
subplot(2,2,2)
semilogy(r,s)
xlabel('x')
ylabel('y(x)')
axis([min(r) max(r) min(s) max(s)])
grid on
subplot(2,2,3)
semilogx(r,s)
xlabel('x')
ylabel('y(x)')
axis([min(r) max(r) min(s) max(s)])
grid on
subplot(2,2,4)
loglog(r,s)
xlabel('x')
ylabel('y(x)')
axis([min(r) max(r) min(s) max(s)])
grid on
Error using ^ (line 51)
Incorrect dimensions for raising a matrix to a power. Check that the matrix is square and the power is a
scalar. To perform elementwise matrix powers, use '.^'.
Error in HW8P3 (line 2)
s=0.75.*((r.^3)/(exp(1)^(.75.*r)));
##### 1 件のコメント表示非表示 なし
Stephen23 2021 年 10 月 27 日

"I am unsure of how I am getting this error"
Did you read the last part of the error message?: To perform elementwise matrix powers, use '.^'.
You probably need to use array operations, not matrix operations:

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### 回答 (1 件)

David Hill 2021 年 10 月 27 日
r=linspace(0.001,1,1000);
s=0.75*((r.^3)./(exp(1).^(.75*r)));%error is here (multiplying by scalar does not need .*, but you need elementwise operations for matrix operations is needed)
subplot(2,2,1)
plot(r,s)
xlabel('x')
ylabel('y(x)')
axis([min(r) max(r) min(s) max(s)])
grid on
subplot(2,2,2)
semilogy(r,s)
xlabel('x')
ylabel('y(x)')
axis([min(r) max(r) min(s) max(s)])
grid on
subplot(2,2,3)
semilogx(r,s)
xlabel('x')
ylabel('y(x)')
axis([min(r) max(r) min(s) max(s)])
grid on
subplot(2,2,4)
loglog(r,s)
xlabel('x')
ylabel('y(x)')
axis([min(r) max(r) min(s) max(s)])
grid on

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