IDL-簡單的練習題

1. 定義顯示一個如圖的圖像 arr = make_array(300,300,value=0) arr[0:99,0:99]=150 arr[0:99,100:199]=75 arr[100:199,0:99]=175 arr[100:199,100:199]=100 arr[100:199,200:299]=25 arr[200:299,0:99]=200 arr[200:299

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