I am getting an error "Variable a must be of data type char. It is currently of type double. Check where the variable is assigned a value."

Question

Chloe 2024-2-13

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https://ww2.mathworks.cn/matlabcentral/answers/2081438-i-am-getting-an-error-variable-a-must-be-of-data-type-char-it-is-currently-of-type-double-check-w

回答： Pratik 2024-2-13

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Question:

Using matrix multiplication, multiply A1 by A1, set to a

Using matrix multiplication, multiply v1 by A1, set to c

Input: A1 = [-2:1; 1:-1:-2; -2:2:4]

v1 = linspace(-2,4,4) 
a = A1 .* A1 
c = v1 .* A1 

output:

Variable a must be of data type char. It is currently of type double. Check where the variable is assigned a value.

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Answer 1

Pratik 2024-2-13

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Hi Chloe,

In my understanding, you want to perform matrix multiplication between A1 & A1 , v1 & A1. The operator to perform matrix multiplication is '*' or function ‘mtimes’. Operator '.*' performs element wise multiplication.

I was not able to reproduce the error mentioned in the question with the code provided.

A1 = [-2:1; 1:-1:-2; -2:2:4] 
A1 = 3×4
    -2    -1     0     1
     1     0    -1    -2
    -2     0     2     4
v1 = linspace(-2,4,4) 
v1 = 1×4
    -2     0     2     4
a = A1 .* A1 
a = 3×4
     4     1     0     1
     1     0     1     4
     4     0     4    16
c = v1 .* A1
c = 3×4
     4     0     0     4
    -2     0    -2    -8
     4     0     4    16